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.vn-container{-webkit-box-align:center;-ms-flex-align:center;align-items:center;display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-pack:justify;-ms-flex-pack:justify;justify-content:space-between;height:3rem;margin:0 auto;max-width:77.5rem;z-index:1}@media(min-width:64rem){.vn-wrapper .vn-container{height:4.6875rem}}.vn-wrapper .vn-container.lite{max-width:100%}@media(min-width:64rem){.vn-wrapper .vn-container.lite{height:3.5rem}}.vn-wrapper .vn-menu-btn{-webkit-box-align:center;-ms-flex-align:center;align-items:center;background:none;border:0;color:#fff;cursor:pointer;display:-webkit-box;display:-ms-flexbox;display:flex;height:100%;line-height:1;padding:0}.vn-wrapper .vn-menu-btn:not(.lite){margin-right:1.166875rem}@media(min-width:64rem){.vn-wrapper .vn-menu-btn:not(.lite){margin-right:0}}.vn-wrapper .vn-menu-btn i{font-size:2.25rem;width:2.25rem;overflow:hidden}.vn-wrapper .vn-menu-btn svg{fill:currentColor;pointer-events:none}.vn-wrapper .vn-menu-btn.vn-search 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.vn-logo-container .vn-logo img:not(.lite){width:7.25rem}}.vn-wrapper .vn-logo-container.with-program .vn-logo img{height:.875rem}@media(min-width:64rem){.vn-wrapper .vn-logo-container.with-program .vn-logo img{height:1.4375rem}}.vn-wrapper .vn-logo-container.with-program .vn-prog-logo img{height:.9375rem}@media(min-width:64rem){.vn-wrapper .vn-logo-container.with-program .vn-prog-logo img{height:1.5625rem}}.vn-wrapper .vn-links{background:#f9f9fc;display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-orient:vertical;-webkit-box-direction:normal;-ms-flex-direction:column;flex-direction:column;height:calc(100vh - 3rem);left:-140vw;overflow:auto;padding:.5rem;position:fixed;top:3rem;-webkit-transition:left .5s ease;transition:left .5s ease;width:100%;z-index:100}@media(min-width:37.5rem){.vn-wrapper .vn-links{max-width:25rem}}@media(min-width:64rem){.vn-wrapper .vn-links.lite{height:calc(100vh - 3.5rem);top:3.5rem}}@media(min-width:64rem){.vn-wrapper 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.vn-menu-section{left:0;opacity:1;visibility:visible}}@media(min-width:81.25rem){.vn-wrapper .vn-links .vn-links-list:not(.lite)>li:not(:nth-child(7)){margin-right:1rem}}.vn-wrapper .vn-links .vn-menu-section{background:#f9f9fc;height:calc(100vh - 3rem);right:-140vw;overflow:auto;padding:0 1.5rem 6.25rem 1.5rem;position:fixed;top:3rem;-webkit-transition:all .5s ease;transition:all .5s ease;width:100%;z-index:10}.vn-wrapper .vn-links .vn-menu-section.lite{height:calc(100vh - 3.5rem);top:3.5rem}@media(min-width:37.5rem){.vn-wrapper .vn-links .vn-menu-section{max-width:25rem;left:-140vw;right:auto}.vn-wrapper .vn-links .vn-menu-section.open{left:0;right:auto}}.vn-wrapper .vn-links .vn-menu-section.open{right:0}.vn-wrapper .vn-links .vn-menu-section .vn-menu-section-header{-webkit-box-align:center;-ms-flex-align:center;align-items:center;border-bottom:1px solid #c6cedb;display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-pack:justify;-ms-flex-pack:justify;justify-content:space-between;padding:.75rem 0}.vn-wrapper .vn-links .vn-menu-section .vn-menu-section-header h3{color:#1b1b1b;font-size:1.25rem;line-height:1;margin:0}.vn-wrapper .vn-links .vn-menu-section .vn-menu-section-header a{color:#3557ff;font-weight:400;text-decoration:none}.vn-wrapper .vn-links .vn-menu-section .vn-menu-section-header a img{margin-right:.5rem;width:.8125rem}.vn-wrapper .vn-links .vn-menu-section ul{margin:.75rem 0;list-style:none;padding:0}.vn-wrapper .vn-links .vn-menu-section ul li{font-size:1.125rem;font-weight:400}.vn-wrapper .vn-links .vn-menu-section ul li a{color:#1b1b1b;display:block;padding:.75rem 0;text-decoration:none}.vn-wrapper .vn-links .vn-menu-section ul li a:hover{color:#3557ff}.vn-wrapper .vn-links .vn-menu-section ul li hr{border:1px solid #c6cedb}@media(min-width:64rem){.vn-wrapper .vn-links .vn-menu-section:not(.lite){background:#fff;border-radius:0 0 5px 5px;border-top:0;left:-20px;margin-left:-3.75rem;max-width:none;height:auto;opacity:0;padding:1.875rem 2.875rem;position:absolute;top:4.6875rem;width:18.75rem;visibility:hidden}.vn-wrapper .vn-links .vn-menu-section:not(.lite) hr{display:none}.vn-wrapper .vn-links .vn-menu-section:not(.lite) ul{margin:0}.vn-wrapper .vn-links .vn-menu-section:not(.lite) ul li{border-bottom:1px solid #c6cedb}.vn-wrapper .vn-links .vn-menu-section:not(.lite) ul li:last-of-type{border-bottom:0}.vn-wrapper .vn-links .vn-menu-section:not(.lite) ul li.vn-see-all a{-webkit-box-align:baseline;-ms-flex-align:baseline;align-items:baseline;color:#3557ff;display:-webkit-box;display:-ms-flexbox;display:flex;-webkit-box-pack:start;-ms-flex-pack:start;justify-content:flex-start}.vn-wrapper .vn-links .vn-menu-section:not(.lite) ul li.vn-see-all a img{height:.75rem;margin-right:.5rem}.vn-wrapper .vn-links .vn-menu-section:not(.lite).hdr-site-1{width:60.875rem}.vn-wrapper .vn-links .vn-menu-section:not(.lite).hdr-site-1 ul{-webkit-columns:4;-moz-columns:4;columns:4;-webkit-column-gap:2.875rem;-moz-column-gap:2.875rem;column-gap:2.875rem}.vn-wrapper .vn-links .vn-menu-section:not(.lite).hdr-site-1 ul li:nth-child(7),.vn-wrapper .vn-links .vn-menu-section:not(.lite).hdr-site-1 ul li:nth-child(14),.vn-wrapper .vn-links .vn-menu-section:not(.lite).hdr-site-1 ul li:nth-child(21){border-bottom:0}.vn-wrapper .vn-links .vn-menu-section:not(.lite).hdr-site-3{width:35rem}.vn-wrapper .vn-links .vn-menu-section:not(.lite).hdr-site-3 ul{-webkit-columns:2;-moz-columns:2;columns:2;-webkit-column-gap:2.875rem;-moz-column-gap:2.875rem;column-gap:2.875rem}.vn-wrapper .vn-links .vn-menu-section:not(.lite).hdr-site-3 ul li:nth-child(8),.vn-wrapper .vn-links .vn-menu-section:not(.lite).hdr-site-3 ul li:nth-child(16){border-bottom:0}}@media(min-width:64rem)and (max-width:81.25rem){.vn-wrapper .vn-links .vn-menu-section:not(.lite).hdr-site-1{margin-left:-8.75rem}}.vn-wrapper .vn-links .vn-back{-webkit-box-align:center;-ms-flex-align:center;align-items:center;background:none;border:0;color:#3557ff;cursor:pointer;display:-webkit-box;display:-ms-flexbox;display:flex;padding:1rem 0}.vn-wrapper .vn-links .vn-back i{font-size:.75rem;margin-right:.3125rem}.vn-wrapper .vn-links .vn-actions{margin-top:1rem}@media(min-width:64rem){.vn-wrapper .vn-links .vn-actions:not(.lite){-webkit-box-align:center;-ms-flex-align:center;align-items:center;border-left:1px solid #cccce7;display:-webkit-box;display:-ms-flexbox;display:flex;margin:1.1875rem 0;padding-left:1.25rem}}@media(min-width:64rem){.vn-wrapper .vn-links .vn-actions:not(.lite).no-subscribe{border-left:none}}.vn-wrapper .vn-links .vn-actions:not(.lite).no-subscribe .vn-signin{padding-left:.9375rem}@media(min-width:64rem){.vn-wrapper .vn-links .vn-actions:not(.lite).no-subscribe .vn-signin{padding-left:0}}.vn-wrapper .vn-links .vn-actions .vn-signin{color:#3557ff;font-weight:600;padding:0 1.5rem;text-decoration:none}@media(min-width:64rem){.vn-wrapper .vn-links .vn-actions .vn-signin:not(.lite){-webkit-box-align:center;-ms-flex-align:center;align-items:center;color:#fff;display:-webkit-box;display:-ms-flexbox;display:flex;font-size:1.0625rem;padding:0;margin:0 .9375rem;-webkit-transition:all .3s ease;transition:all .3s ease}}.vn-wrapper .vn-links .vn-actions .vn-loggedin{background:none;border:0;color:#3557ff;font-weight:600;height:3rem;padding:0 1.5rem;text-decoration:none}@media(min-width:64rem){.vn-wrapper .vn-links .vn-actions .vn-loggedin:not(.lite){-webkit-box-align:center;-ms-flex-align:center;align-items:center;color:#fff;display:-webkit-box;display:-ms-flexbox;display:flex;font-size:0;padding:0;margin:0 1.25rem}.vn-wrapper .vn-links .vn-actions .vn-loggedin:not(.lite):before{background:url(//img.lb.wbmdstatic.com/webmd_static_vue/091e9c5e81e4870f/client/img/person.59072d56.svg) 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pane" style="" id="ContentPane30" tabindex="-1"><article class="article medref" data-chronicle="091e9c5e81e48710" data-e2e="dart-medref" data-page="1" data-module-type="dynamic-article" data-artid="091e9c5e815b5ed7" style=""><script type="application/ld+json"></script><script type="application/ld+json">{"@context":"https://schema.org/","@type":"MedicalWebPage","mainEntityOfPage":"https://www.webmd.com/a-to-z-guides/magnesium-test","lastReviewed":"03/26/2024 10:50:22","reviewedBy":{"@type":"Person","name":"Jabeen Begum, MD"},"about":"Lab Tests","datePublished":"02/23/2017 20:00:00","headline":"What Is a Magnesium Test?","author":{"@type":"Person","name":"Rachel Reiff Ellis"},"dateModified":"03/26/2024 10:50:22","primaryImageOfPage":{"@type":"ImageObject","name":"what_is_a_magnesium_test_bigbead.jpg","description":"THUMBNAIL, Healthy food nutrition dieting concept. Assortment of high magnesium sources. Banana chocolate spinach chard, avocado, buckwheat, sesame chia flax seeds, yogurt, nuts, beans oat","license":"iStock/Getty Images","url":"https://img.lb.wbmdstatic.com/vim/live/webmd/consumer_assets/site_images/article_thumbnails/BigBead/what_is_a_magnesium_test_bigbead/what_is_a_magnesium_test_bigbead.jpg","thumbnailUrl":"https://img.lb.wbmdstatic.com/vim/live/webmd/consumer_assets/site_images/article_thumbnails/BigBead/what_is_a_magnesium_test_bigbead/what_is_a_magnesium_test_bigbead.jpg"},"publisher":{"@type":"Organization","name":"WebMD","logo":{"@type":"ImageObject","url":"https://img.lb.wbmdstatic.com/vim/live/webmd/consumer_assets/site_images/logos/webmd/web/webmd_logo_53x12.gif"}}}</script><div class="inner-article-container"><header><h1>What Is a Magnesium Test?</h1></header><div class="med-wrap"><div><div class="asset-med-rev"><div class="reviewer-info" data-chronicle="091e9c5e81e48710" data-e2e="asset-medical-review" data-metrics-module="rvdby-lnk"><span class="reviewer-photo-cont"><figure><img src="https://img.lb.wbmdstatic.com/vim/live/webmd/consumer_assets/site_images/articles/biographies/begum_jabeen_382x382.jpg?resize=51px:51px&output-quality=75" class="reviewer-photo"></figure></span><span class="reviewer-txt seperatorLine">Medically Reviewed by <a class="person" href="https://www.webmd.com/bio/jabeen-begum" data-metrics-link="0">Jabeen Begum, MD</a><span class="no-link"></span><span class="revDate"> on March 26, 2024</span></span></div><div class="byline"><span><span class="authors" data-metrics-module="wrtnby-lnk">Written by <a href="https://www.webmd.com/bio/rachel-ellis" class="person" data-metrics-link="0">Rachel Reiff Ellis</a></span></span></div></div></div></div><aside class="oncology-article-nav" data-metrics-module="cwnav-art"><ul class="nav-items desktop"><li><a href="#091e9c5e815b5ed7-1-1">What Is Magnesium?</a></li><li><a href="#091e9c5e815b5ed7-1-3">When to Get a Magnesium Test</a></li><li><a href="#091e9c5e815b5ed7-2-4">What Do Magnesium Levels Mean?</a></li><li><a href="#091e9c5e815b5ed7-2-5">Low Magnesium Levels</a><div class="item-button"><a href="#"></a></div></li><li><a href="#091e9c5e815b5ed7-3-7">High Magnesium Levels</a></li><li><a href="#091e9c5e815b5ed7-3-9">Blood Test for Magnesium</a></li><li><a href="#091e9c5e815b5ed7-3-10">Magnesium Urine Test</a></li><li><a href="#091e9c5e815b5ed7-3-11">Magnesium Red Blood Cell Test</a></li><li><a href="#091e9c5e815b5ed7-3-12">Magnesium EXA Test</a></li><li><a href="#091e9c5e815b5ed7-4-13">Takeaways</a></li><li class="item-button"></li></ul></aside><div class="reading-wrapper"><div class="readtime"><span>6 min read</span></div><div id="audio-placeholder-091e9c5e815b5ed7"></div></div><div class="article__body" data-metrics-module="embd-lnk"><div class="article-page active-page" data-page="1"><section><h2 class="jumplink-headers" id="091e9c5e815b5ed7-1-1">What Is Magnesium?</h2><p dir="ltr"><span>Magnesium is one of the major minerals your body needs to function properly. You get it from foods and supplements. It's also an ingredient in some medicines such as antacids and laxatives. More than half the magnesium you have in your body is stored in your bones and tissues. </span></p><p dir="ltr"><span><strong>How is magnesium used in the body?</strong></span></p><p dir="ltr"><span>Magnesium does a lot to help your body work well. It's involved in almost 300 different enzyme activities. Enzymes are proteins that help speed up chemical reactions in the body. These chemical reactions help to:</span></p><ul><li dir="ltr" aria-level="1"><span>Build proteins and strong bones</span></li><li dir="ltr" aria-level="1"><span>Regulate blood sugar</span></li><li dir="ltr" aria-level="1"><span>Maintain blood pressure</span></li><li dir="ltr" aria-level="1"><span>Digest fatty acids</span></li><li dir="ltr" aria-level="1"><span>Support muscle and nerve functions</span></li><li dir="ltr" aria-level="1"><span>Regulate the </span><a class="" href="https://www.webmd.com/a-to-z-guides/cortisol-test" id="c801f1cd-67bc-445d-ac85-d5a51edf5a3d;medical_reference">hormone cortisol</a><span> to control stress </span></li><li dir="ltr" aria-level="1">Support restful sleep</li></ul><p dir="ltr"><span>Magnesium also helps balance the levels of calcium, copper, zinc, potassium, vitamin D, and other important nutrients in your body. And it aids the transport of calcium and potassium ions across cell membranes. This helps your nerves send signals, your muscles to contract, and your heart to beat in a normal, steady rhythm.</span></p></section><section><pagebreak /> <p dir="ltr"><span><strong>How to get more magnesium</strong></span></p><p dir="ltr"><span>The recommended daily amount of magnesium is 320-420 milligrams. If you eat a well-balanced diet you'll get all the magnesium you need. If you want to boost your levels, these foods are good sources:</span></p><ul><li dir="ltr" aria-level="1"><span>Whole Brazil nuts (250 mg per 1/2 cup) </span></li><li dir="ltr" aria-level="1"><span>Cooked spinach (157 mg per cup)</span></li><li dir="ltr" aria-level="1"><span>Pumpkin seeds (150 mg per ounce)</span></li><li dir="ltr" aria-level="1"><span>Black beans (120 mg per cup)</span></li><li dir="ltr" aria-level="1"><span>Almonds (80 mg per ounce)</span></li><li dir="ltr" aria-level="1"><span>Cashews (72 mg per ounce)</span></li><li dir="ltr" aria-level="1"><span>Dried figs (68 mg per 11 figs)</span></li><li dir="ltr" aria-level="1"><span>Dark chocolate (64 mg per ounce)</span></li><li dir="ltr" aria-level="1"><span>Avocados (58 mg per medium avocado)</span></li></ul><p dir="ltr"><span>You can take magnesium as a supplement, but dietitians recommend you try to get it from food sources before going that route. Always talk to your doctor before taking any supplement. </span></p><div id="art-091e9c5e815b5ed7-em-image-1" class="em-mod-image" ref="art-091e9c5e815b5ed7-em-image-1"> <aside data-e2e="ia-image" align="left" class="ia-module-container ia-image landscape " data-metric-module="ia-img-soc"> <figure> <div class="main"> <img src="https://img.lb.wbmdstatic.com/vim/live/webmd/consumer_assets/site_images/article_thumbnails/BigBead/what_is_a_magnesium_test_bigbead/what_is_a_magnesium_test_bigbead.jpg" alt="photo of Healthy food nutrition dieting concept"/> </div> <figcaption> <p class="module_description" > Magnesium is a mineral found in the Earth's crust, as well as in foods like Brazil nuts, avocado, and dark chocolate. (Photo credit: iStock/Getty Images) </p> </figcaption> </figure> </aside> </div></section><section><h2 class="jumplink-headers" id="091e9c5e815b5ed7-1-3">When to Get a Magnesium Test</h2><p dir="ltr"><span>Some health problems can affect the amount of magnesium in your body. Your doctor may want to monitor your magnesium levels with a test if you have:</span></p><ul><li dir="ltr" aria-level="1"><span>Chronic kidney disease</span></li><li dir="ltr" aria-level="1"><span>Uncontrolled diabetes </span></li><li dir="ltr" aria-level="1"><span>Alcohol use disorder</span></li><li dir="ltr" aria-level="1"><span>Malabsorption syndrome (your body has trouble absorbing nutrients from food)</span></li><li dir="ltr" aria-level="1"><span>Malnutrition</span></li><li dir="ltr" aria-level="1"><span>Chronic (long-lasting) </span><a class="" href="https://www.webmd.com/digestive-disorders/digestive-diseases-diarrhea" id="81131394-f1f1-4507-9408-0bfb94db63fa;medical_reference">diarrhea</a></li><li dir="ltr" aria-level="1"><span>Low levels of potassium and/or calcium</span></li></ul><p dir="ltr"><span>Some medications can raise or lower your magnesium levels, such as: </span></p><ul><li dir="ltr" aria-level="1"><span>Diuretics (also called water pills)</span></li><li dir="ltr" aria-level="1"><span>Certain antibiotics</span></li><li dir="ltr" aria-level="1"><span>Proton pump inhibitors to reduce stomach acid</span></li><li dir="ltr" aria-level="1"><span>Medicines that can increase magnesium levels, such as aspirin, lithium, laxatives, and antacids</span></li></ul></section></div><div class="article-page " data-page="2"><section><h2 class="jumplink-headers" id="091e9c5e815b5ed7-2-4">What Do Magnesium Levels Mean?</h2><p dir="ltr"><span>Your body functions best when your magnesium levels are balanced—not too high and not too low.</span></p><p dir="ltr"><span><strong>Normal magnesium levels</strong></span></p><p dir="ltr"><span>A normal range for magnesium levels in your blood is 1.7 to 2.2 mg/dL. If, from time to time, your diet isn't giving you enough magnesium, your body can maintain this normal range because of the stores of magnesium in your bones. Your body also has a way to get rid of extra magnesium if your levels are high. </span></p><p dir="ltr"><span><strong>What is a magnesium deficiency?</strong></span></p><p dir="ltr"><span>A deficiency is when you have lower than normal levels of a nutrient. It's not common to have magnesium deficiency. Doctors don't test for magnesium levels in routine blood tests. But there are signs and symptoms that may tell them it's time to check out your magnesium levels.</span></p></section><section><h2 class="jumplink-headers" id="091e9c5e815b5ed7-2-5">Low Magnesium Levels</h2><p dir="ltr"><span>Having low magnesium levels is also called </span><a class="" href="https://www.webmd.com/children/what-is-hypomagnesemia" id="a21edbf6-a069-4905-a2c4-5eb45f2f02b5;medical_reference">hypomagnesemia</a><span>. Only about 2% of people in the general population have it. </span></p><p dir="ltr"><span><strong>What causes low magnesium levels?</strong></span></p></section><section> <p dir="ltr"><span>Aside from medical conditions and medications that may cause it, your chances of having a magnesium deficiency go up if you have a stay in the hospital, have an alcohol use disorder, or your diabetes isn't well-controlled. </span></p><p dir="ltr"><span><strong>Low magnesium symptoms</strong></span></p><p dir="ltr"><span>Not having enough magnesium in your body can cause:</span></p><ul><li dir="ltr" aria-level="1"><span>Tremors</span></li><li dir="ltr" aria-level="1"><span>Muscle spasms</span></li><li dir="ltr" aria-level="1"><span>Muscle cramps and/or numbness in your hands and feet</span></li><li dir="ltr" aria-level="1"><span>Abnormal eye movements (nystagmus)</span></li><li dir="ltr" aria-level="1"><span>Fatigue and weakness</span></li></ul><p dir="ltr"><span>If your magnesium levels get dangerously low, you may:</span></p><ul><li dir="ltr" aria-level="1"><span>Have seizures</span></li><li dir="ltr" aria-level="1">Feel confused</li><li dir="ltr" aria-level="1"><span>Have abnormal heart rhythms (</span><a class="" href="https://www.webmd.com/heart-disease/atrial-fibrillation/heart-disease-abnormal-heart-rhythm" id="31505fcd-0c78-4086-8190-caeb43595d7c;medical_reference">arrhythmia</a><span>)</span></li></ul></section></div><div class="article-page " data-page="3"><section><h2 class="jumplink-headers" id="091e9c5e815b5ed7-3-7">High Magnesium Levels</h2><p dir="ltr"><span>It's very uncommon to have too much magnesium in your body, but if you do, it's called hypermagnesemia. </span></p><p dir="ltr"><span><strong>What causes high magnesium levels?</strong></span></p><p dir="ltr"><span>Most cases of high magnesium happen in people who live with kidney disease. Some older adults with kidney disease may not absorb magnesium correctly, causing it to build up in their body. Your risk of this goes up if you regularly take medications with magnesium, such as antacids or laxatives. </span></p></section><section><pagebreak /> <p dir="ltr"><span>You may also get it if you have:</span></p><ul><li><a class="" href="https://www.webmd.com/women/hypothyroidism-underactive-thyroid-symptoms-causes-treatments" id="a6c7bda0-109a-452e-9a22-6b55750bd042;medical_reference">Hypothyroidism</a> (when your thyroid glands don't make enough thyroid hormones) </li><li><p dir="ltr">Cortico-adrenal insufficiency (when adrenal glands don't make enough of the hormone cortisol)</p></li></ul><p dir="ltr"><span><strong>High magnesium symptoms</strong></span></p><p dir="ltr"><span>If you have too much magnesium in your system, you might have:</span></p><ul><li dir="ltr" aria-level="1"><span>Low blood pressure (hypotension)</span></li><li dir="ltr" aria-level="1"><span>Heart arrhythmias</span></li><li dir="ltr" aria-level="1"><span>Confusion</span></li><li dir="ltr" aria-level="1"><span>Weakness and lack of energy</span></li></ul></section><section><h2 class="jumplink-headers" id="091e9c5e815b5ed7-3-9">Blood Test for Magnesium</h2><p><span>A test called a serum magnesium test measures the amount of magnesium you have in your bloodstream. To do the test, your doctor will draw a blood sample from a vein in your arm with a small needle. They'll send this sample to a lab to test the magnesium levels. </span></p></section><section><h2 class="jumplink-headers" id="091e9c5e815b5ed7-3-10">Magnesium Urine Test</h2><p><span>Your doctor can also test the amount of magnesium in your urine. A magnesium urine test isn't the normal urine test you might be used to, where you pee into a cup at your doctor's office and they send only that sample for testing. A magnesium urine test usually involves collecting your pee over 24 hours This is because your levels may go up and down based on the foods you've eaten that day.</span></p></section><section><h2 class="jumplink-headers" id="091e9c5e815b5ed7-3-11">Magnesium Red Blood Cell Test</h2><p dir="ltr"><span>This test measures the levels of magnesium inside your red blood cells. It may be a more sensitive test for detecting low levels of magnesium than a regular magnesium blood test. </span></p><p dir="ltr"><span>Just like a magnesium blood test, a technician takes a vial of blood from a vein in your arm and sends it to a lab for testing. </span></p></section><section><h2 class="jumplink-headers" id="091e9c5e815b5ed7-3-12">Magnesium EXA Test</h2><p dir="ltr"><span>For this test, your doctor gently swipes the inside of your cheeks to gather cells that they then wipe on a test strip. The test strip goes to a lab for analysis. </span></p><p dir="ltr"><span>At the lab, an electron microscope scans the cells and sends </span><a class="" href="https://www.webmd.com/a-to-z-guides/what-is-x-ray" id="4899a8e2-d0f7-4212-9610-34f839abdced;medical_reference">X-rays</a><span> through them. Different minerals in your cells release different amounts of energy. The test can see how much magnesium you have based on these readings. </span></p></section></div><div class="article-page " data-page="4"><section><h2 class="jumplink-headers" id="091e9c5e815b5ed7-4-13">Takeaways</h2><p dir="ltr"><span>Magnesium is an essential mineral your body needs for multiple functions, such as energy production, making protein, helping muscles contract, and maintaining healthy bones and a healthy heart. You can get it from foods such as green leafy vegetables, </span><a class="" href="https://www.webmd.com/diet/health-benefits-of-whole-grain-pasta" id="d92c07bf-1245-4126-bc51-6c3cb7dc0a23;medical_reference">whole grains</a><span>, beans, and nuts.</span></p><p dir="ltr"><span>Most people get enough magnesium from a well-balanced diet, but certain conditions can raise or lower your levels. Having too much or too little magnesium causes certain symptoms, some of which can be serious. Your doctor can do tests to find out what your magnesium levels are.</span></p></section></div></div><div class="related-articles" data-metrics-module="cwnav-art" data-metrics-sel="li"></div><footer><div class="pub-info-and-share-bar"><div class="article__publication-sources"><section class="asset-footer"><div class="asset-footer-top"><div class="asset-footer-buttons"><button class="sources-btn">Sources</button><button class="update-history-btn">Update History</button></div><div class="asset-footer-top-share"><div class="module module-social-share-footer" data-e2e="social-sharebar"><div class="socialshare-container" data-metrics-module="fm-shr"><div class="share-footer-container"><div class="share-text">Share</div><div class="icon-sb-footer-svg icon-sb-footer-share"><svg class="icon-sb-footer-svg" width="18" height="20" viewbox="0 0 18 20" fill="none" xmlns="https://www.w3.org/2000/svg"><path class="icon-sb-footer-svg" d="M15 20C14.1667 20 13.4583 19.7083 12.875 19.125C12.2917 18.5417 12 17.8333 12 17C12 16.8833 12.0083 16.7623 12.025 16.637C12.0417 16.5123 12.0667 16.4 12.1 16.3L5.05 12.2C4.76667 12.45 4.45 12.6457 4.1 12.787C3.75 12.929 3.38333 13 3 13C2.16667 13 1.45833 12.7083 0.875 12.125C0.291667 11.5417 0 10.8333 0 10C0 9.16667 0.291667 8.45833 0.875 7.875C1.45833 7.29167 2.16667 7 3 7C3.38333 7 3.75 7.07067 4.1 7.212C4.45 7.354 4.76667 7.55 5.05 7.8L12.1 3.7C12.0667 3.6 12.0417 3.48767 12.025 3.363C12.0083 3.23767 12 3.11667 12 3C12 2.16667 12.2917 1.45833 12.875 0.875C13.4583 0.291667 14.1667 0 15 0C15.8333 0 16.5417 0.291667 17.125 0.875C17.7083 1.45833 18 2.16667 18 3C18 3.83333 17.7083 4.54167 17.125 5.125C16.5417 5.70833 15.8333 6 15 6C14.6167 6 14.25 5.929 13.9 5.787C13.55 5.64567 13.2333 5.45 12.95 5.2L5.9 9.3C5.93333 9.4 5.95833 9.51233 5.975 9.637C5.99167 9.76233 6 9.88333 6 10C6 10.1167 5.99167 10.2373 5.975 10.362C5.95833 10.4873 5.93333 10.6 5.9 10.7L12.95 14.8C13.2333 14.55 13.55 14.354 13.9 14.212C14.25 14.0707 14.6167 14 15 14C15.8333 14 16.5417 14.2917 17.125 14.875C17.7083 15.4583 18 16.1667 18 17C18 17.8333 17.7083 18.5417 17.125 19.125C16.5417 19.7083 15.8333 20 15 20ZM15 4C15.2833 4 15.5207 3.90433 15.712 3.713C15.904 3.521 16 3.28333 16 3C16 2.71667 15.904 2.479 15.712 2.287C15.5207 2.09567 15.2833 2 15 2C14.7167 2 14.4793 2.09567 14.288 2.287C14.096 2.479 14 2.71667 14 3C14 3.28333 14.096 3.521 14.288 3.713C14.4793 3.90433 14.7167 4 15 4ZM3 11C3.28333 11 3.521 10.904 3.713 10.712C3.90433 10.5207 4 10.2833 4 10C4 9.71667 3.90433 9.479 3.713 9.287C3.521 9.09567 3.28333 9 3 9C2.71667 9 2.479 9.09567 2.287 9.287C2.09567 9.479 2 9.71667 2 10C2 10.2833 2.09567 10.5207 2.287 10.712C2.479 10.904 2.71667 11 3 11ZM15 18C15.2833 18 15.5207 17.904 15.712 17.712C15.904 17.5207 16 17.2833 16 17C16 16.7167 15.904 16.4793 15.712 16.288C15.5207 16.096 15.2833 16 15 16C14.7167 16 14.4793 16.096 14.288 16.288C14.096 16.4793 14 16.7167 14 17C14 17.2833 14.096 17.5207 14.288 17.712C14.4793 17.904 14.7167 18 15 18Z"></path></svg></div></div></div></div><div data-v-00aa1eb2><div class="print-footer-container" data-v-00aa1eb2><div class="print-text" data-v-00aa1eb2>Print</div><div class="icon-sb-footer-print" data-v-00aa1eb2><svg width="20" height="18" viewbox="0 0 20 18" fill="none" xmlns="https://www.w3.org/2000/svg" data-v-00aa1eb2><path d="M14 5V2H6V5H4V0H16V5H14ZM16 9.5C16.2833 9.5 16.5208 9.40417 16.7125 9.2125C16.9042 9.02083 17 8.78333 17 8.5C17 8.21667 16.9042 7.97917 16.7125 7.7875C16.5208 7.59583 16.2833 7.5 16 7.5C15.7167 7.5 15.4792 7.59583 15.2875 7.7875C15.0958 7.97917 15 8.21667 15 8.5C15 8.78333 15.0958 9.02083 15.2875 9.2125C15.4792 9.40417 15.7167 9.5 16 9.5ZM14 16V12H6V16H14ZM16 18H4V14H0V8C0 7.15 0.291667 6.4375 0.875 5.8625C1.45833 5.2875 2.16667 5 3 5H17C17.85 5 18.5625 5.2875 19.1375 5.8625C19.7125 6.4375 20 7.15 20 8V14H16V18ZM18 12V8C18 7.71667 17.9042 7.47917 17.7125 7.2875C17.5208 7.09583 17.2833 7 17 7H3C2.71667 7 2.47917 7.09583 2.2875 7.2875C2.09583 7.47917 2 7.71667 2 8V12H4V10H16V12H18Z" fill="#3557FF" data-v-00aa1eb2></path></svg></div></div></div><div class="save-container"><div class="auth-overlay-popup-holder" data-v-28242611><div class="bookmark-holder drug-generic-name" data-metrics-module="bkmk" data-v-28242611></div></div></div></div></div><div class="asset-footer-content"><div class="sources-section" style="display:none;"><div class="sources-wrapper" data-metrics-module="src"><p>SOURCES:</p><p dir="ltr"><span>National Institutes of Health Office of Dietary Supplements: “Magnesium.”</span></p><p dir="ltr"><span>Harvard T.H. Chan School of Public Health: “Magnesium.”</span></p><p dir="ltr"><span>University Hospitals: “The Surprising Health Benefits of Magnesium.”</span></p><p dir="ltr"><span>Mount Sinai: “Magnesium.”</span></p><p dir="ltr"><span>Academy of Nutrition and Dietetics: “What is Magnesium?”</span></p><p dir="ltr"><span>MedlinePlus: “Magnesium Blood Test.”</span></p><p dir="ltr"><span>Houston Methodist: “Magnesium Deficiency: Symptoms, Causes & How to Test for It.”</span></p><p dir="ltr"><span>Cleveland Clinic: “Hypomagnesemia.”</span></p><p dir="ltr"><span>StatPearls: “Hypermagnesemia.”</span></p><p dir="ltr"><span>Nutritional Magnesium Association: “Magnesium Testing.”</span></p></div></div></div><div class="asset-footer-bottom"><a href="https://www.webmd.com/about-webmd-policies/about-privacy-policy" class="asset-footer-policy"> View privacy policy, copyright and trust info </a></div><div class="asset-footer-bottom-share"><div class="module module-social-share-footer" 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These chemical reactions help to:\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cul\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EBuild proteins and strong bones\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003ERegulate blood sugar\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EMaintain blood pressure\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EDigest fatty acids\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003ESupport muscle and nerve functions\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003ERegulate the \u003C\u002Fspan\u003E\u003Ca class=\"\" link_friendlyurl=\"https:\u002F\u002Fwww.webmd.com\u002Fa-to-z-guides\u002Fcortisol-test\" id=\"c801f1cd-67bc-445d-ac85-d5a51edf5a3d;medical_reference\"\u003Ehormone cortisol\u003C\u002Fa\u003E\u003Cspan\u003E to control stress \u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003ESupport restful sleep\u003C\u002Fli\u003E\u003C\u002Ful\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EMagnesium also helps balance the levels of calcium, copper, zinc, potassium, vitamin D, and other important nutrients in your body. And it aids the transport of calcium and potassium ions across cell membranes. This helps your nerves send signals, your muscles to contract, and your heart to beat in a normal, steady rhythm.\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003C\u002Fsection_text\u003E\u003Chighlights\u003E\u003C\u002Fhighlights\u003E\u003Cpull_quotes\u003E\u003C\u002Fpull_quotes\u003E\u003C\u002Fsection_group\u003E\u003Csection_group\u003E\u003Cpagebreak type=\"mobile\" order=\"2\" \u002F\u003E\u003Cpagebreak \u002F\u003E\u003Csection_header is_continued=\"true\"\u003EWhat Is Magnesium? continued...\u003C\u002Fsection_header\u003E\u003Csection_text\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003E\u003Cstrong\u003EHow to get more magnesium\u003C\u002Fstrong\u003E\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EThe recommended daily amount of magnesium is 320-420 milligrams. If you eat a well-balanced diet you'll get all the magnesium you need. If you want to boost your levels, these foods are good sources:\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cul\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EWhole Brazil nuts (250 mg per 1\u002F2 cup) \u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003ECooked spinach (157 mg per cup)\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EPumpkin seeds (150 mg per ounce)\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EBlack beans (120 mg per cup)\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EAlmonds (80 mg per ounce)\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003ECashews (72 mg per ounce)\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EDried figs (68 mg per 11 figs)\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EDark chocolate (64 mg per ounce)\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EAvocados (58 mg per medium avocado)\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003C\u002Ful\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EYou can take magnesium as a supplement, but dietitians recommend you try to get it from food sources before going that route. Always talk to your doctor before taking any supplement. \u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cembeded_module class=\"wbmdembededmodule cke_widget_inline\" align=\"left\" suppress_from_site=\"false\" suppress_from_fed=\"false\" suppress_share=\"false\" thumbnail=\"\u002Fwebmd\u002Fconsumer_assets\u002Fsite_images\u002Farticle_thumbnails\u002FBigBead\u002Fwhat_is_a_magnesium_test_bigbead\u002Fwhat_is_a_magnesium_test_bigbead.jpg\" _chronic_id=\"7e01debb-53d0-4fee-a7b1-34513c3ea64b\" asset_title=\"\" asset_description=\"Magnesium is a mineral found in the Earth's crust, as well as in foods like Brazil nuts, avocado, and dark chocolate. (Photo credit: iStock\u002FGetty Images)\" module_title=\"\" module_description=\"\" link_out_url=\"\" link_out_position=\"\" type=\"image\" height=\"1200\" width=\"1800\" alt=\"photo of Healthy food nutrition dieting concept\" aspen_id=\"7e01debb-53d0-4fee-a7b1-34513c3ea64b\"\u003E\u003C\u002Fembeded_module\u003E\u003C\u002Fsection_text\u003E\u003Chighlights\u003E\u003C\u002Fhighlights\u003E\u003Cpull_quotes\u003E\u003C\u002Fpull_quotes\u003E\u003C\u002Fsection_group\u003E\u003Csection_group\u003E\u003Csection_header\u003EWhen to Get a Magnesium Test\u003C\u002Fsection_header\u003E\u003Csection_text\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003ESome health problems can affect the amount of magnesium in your body. Your doctor may want to monitor your magnesium levels with a test if you have:\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cul\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EChronic kidney disease\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EUncontrolled diabetes \u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EAlcohol use disorder\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EMalabsorption syndrome (your body has trouble absorbing nutrients from food)\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EMalnutrition\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EChronic (long-lasting) \u003C\u002Fspan\u003E\u003Ca class=\"\" link_friendlyurl=\"https:\u002F\u002Fwww.webmd.com\u002Fdigestive-disorders\u002Fdigestive-diseases-diarrhea\" id=\"81131394-f1f1-4507-9408-0bfb94db63fa;medical_reference\"\u003Ediarrhea\u003C\u002Fa\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003ELow levels of potassium and\u002For calcium\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003C\u002Ful\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003ESome medications can raise or lower your magnesium levels, such as: \u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cul\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EDiuretics (also called water pills)\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003ECertain antibiotics\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EProton pump inhibitors to reduce stomach acid\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EMedicines that can increase magnesium levels, such as aspirin, lithium, laxatives, and antacids\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003C\u002Ful\u003E\u003C\u002Fsection_text\u003E\u003Chighlights\u003E\u003C\u002Fhighlights\u003E\u003Cpull_quotes\u003E\u003C\u002Fpull_quotes\u003E\u003C\u002Fsection_group\u003E\u003Csection_group\u003E\u003Cpagebreak type=\"mobile\" order=\"3\" \u002F\u003E\u003Cpagebreak type=\"desktop\" order=\"2\" \u002F\u003E\u003Csection_header\u003EWhat Do Magnesium Levels Mean?\u003C\u002Fsection_header\u003E\u003Csection_text\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EYour body functions best when your magnesium levels are balanced—not too high and not too low.\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003E\u003Cstrong\u003ENormal magnesium levels\u003C\u002Fstrong\u003E\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EA normal range for magnesium levels in your blood is 1.7 to 2.2 mg\u002FdL. If, from time to time, your diet isn't giving you enough magnesium, your body can maintain this normal range because of the stores of magnesium in your bones. Your body also has a way to get rid of extra magnesium if your levels are high. \u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003E\u003Cstrong\u003EWhat is a magnesium deficiency?\u003C\u002Fstrong\u003E\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EA deficiency is when you have lower than normal levels of a nutrient. It's not common to have magnesium deficiency. Doctors don't test for magnesium levels in routine blood tests. But there are signs and symptoms that may tell them it's time to check out your magnesium levels.\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003C\u002Fsection_text\u003E\u003Chighlights\u003E\u003C\u002Fhighlights\u003E\u003Cpull_quotes\u003E\u003C\u002Fpull_quotes\u003E\u003C\u002Fsection_group\u003E\u003Csection_group\u003E\u003Csection_header\u003ELow Magnesium Levels\u003C\u002Fsection_header\u003E\u003Csection_text\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EHaving low magnesium levels is also called \u003C\u002Fspan\u003E\u003Ca class=\"\" link_friendlyurl=\"https:\u002F\u002Fwww.webmd.com\u002Fchildren\u002Fwhat-is-hypomagnesemia\" id=\"a21edbf6-a069-4905-a2c4-5eb45f2f02b5;medical_reference\"\u003Ehypomagnesemia\u003C\u002Fa\u003E\u003Cspan\u003E. Only about 2% of people in the general population have it. \u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003E\u003Cstrong\u003EWhat causes low magnesium levels?\u003C\u002Fstrong\u003E\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003C\u002Fsection_text\u003E\u003Chighlights\u003E\u003C\u002Fhighlights\u003E\u003Cpull_quotes\u003E\u003C\u002Fpull_quotes\u003E\u003C\u002Fsection_group\u003E\u003Csection_group\u003E\u003Cpagebreak type=\"mobile\" order=\"4\" \u002F\u003E\u003Csection_header is_continued=\"true\"\u003ELow Magnesium Levels continued...\u003C\u002Fsection_header\u003E\u003Csection_text\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EAside from medical conditions and medications that may cause it, your chances of having a magnesium deficiency go up if you have a stay in the hospital, have an alcohol use disorder, or your diabetes isn't well-controlled. \u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003E\u003Cstrong\u003ELow magnesium symptoms\u003C\u002Fstrong\u003E\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003ENot having enough magnesium in your body can cause:\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cul\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003ETremors\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EMuscle spasms\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EMuscle cramps and\u002For numbness in your hands and feet\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EAbnormal eye movements (nystagmus)\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EFatigue and weakness\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003C\u002Ful\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EIf your magnesium levels get dangerously low, you may:\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cul\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EHave seizures\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003EFeel confused\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EHave abnormal heart rhythms (\u003C\u002Fspan\u003E\u003Ca class=\"\" link_friendlyurl=\"https:\u002F\u002Fwww.webmd.com\u002Fheart-disease\u002Fatrial-fibrillation\u002Fheart-disease-abnormal-heart-rhythm\" id=\"31505fcd-0c78-4086-8190-caeb43595d7c;medical_reference\"\u003Earrhythmia\u003C\u002Fa\u003E\u003Cspan\u003E)\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003C\u002Ful\u003E\u003C\u002Fsection_text\u003E\u003Chighlights\u003E\u003C\u002Fhighlights\u003E\u003Cpull_quotes\u003E\u003C\u002Fpull_quotes\u003E\u003C\u002Fsection_group\u003E\u003Csection_group\u003E\u003Cpagebreak type=\"desktop\" order=\"3\" \u002F\u003E\u003Csection_header\u003EHigh Magnesium Levels\u003C\u002Fsection_header\u003E\u003Csection_text\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EIt's very uncommon to have too much magnesium in your body, but if you do, it's called hypermagnesemia. \u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003E\u003Cstrong\u003EWhat causes high magnesium levels?\u003C\u002Fstrong\u003E\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EMost cases of high magnesium happen in people who live with kidney disease. Some older adults with kidney disease may not absorb magnesium correctly, causing it to build up in their body. Your risk of this goes up if you regularly take medications with magnesium, such as antacids or laxatives. \u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003C\u002Fsection_text\u003E\u003Chighlights\u003E\u003C\u002Fhighlights\u003E\u003Cpull_quotes\u003E\u003C\u002Fpull_quotes\u003E\u003C\u002Fsection_group\u003E\u003Csection_group\u003E\u003Cpagebreak type=\"mobile\" order=\"5\" \u002F\u003E\u003Cpagebreak \u002F\u003E\u003Csection_header is_continued=\"true\"\u003EHigh Magnesium Levels continued...\u003C\u002Fsection_header\u003E\u003Csection_text\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EYou may also get it if you have:\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cul\u003E\u003Cli\u003E\u003Ca class=\"\" link_friendlyurl=\"https:\u002F\u002Fwww.webmd.com\u002Fwomen\u002Fhypothyroidism-underactive-thyroid-symptoms-causes-treatments\" id=\"a6c7bda0-109a-452e-9a22-6b55750bd042;medical_reference\"\u003EHypothyroidism\u003C\u002Fa\u003E (when your thyroid glands don't make enough thyroid hormones) \u003C\u002Fli\u003E\u003Cli\u003E\u003Cp dir=\"ltr\"\u003ECortico-adrenal insufficiency (when adrenal glands don't make enough of the hormone cortisol)\u003C\u002Fp\u003E\u003C\u002Fli\u003E\u003C\u002Ful\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003E\u003Cstrong\u003EHigh magnesium symptoms\u003C\u002Fstrong\u003E\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EIf you have too much magnesium in your system, you might have:\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cul\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003ELow blood pressure (hypotension)\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EHeart arrhythmias\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EConfusion\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003Cli dir=\"ltr\" aria-level=\"1\"\u003E\u003Cspan\u003EWeakness and lack of energy\u003C\u002Fspan\u003E\u003C\u002Fli\u003E\u003C\u002Ful\u003E\u003C\u002Fsection_text\u003E\u003Chighlights\u003E\u003C\u002Fhighlights\u003E\u003Cpull_quotes\u003E\u003C\u002Fpull_quotes\u003E\u003C\u002Fsection_group\u003E\u003Csection_group\u003E\u003Csection_header\u003EBlood Test for Magnesium\u003C\u002Fsection_header\u003E\u003Csection_text\u003E\u003Cp\u003E\u003Cspan\u003EA test called a serum magnesium test measures the amount of magnesium you have in your bloodstream. To do the test, your doctor will draw a blood sample from a vein in your arm with a small needle. They'll send this sample to a lab to test the magnesium levels. \u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003C\u002Fsection_text\u003E\u003Chighlights\u003E\u003C\u002Fhighlights\u003E\u003Cpull_quotes\u003E\u003C\u002Fpull_quotes\u003E\u003C\u002Fsection_group\u003E\u003Csection_group\u003E\u003Csection_header\u003EMagnesium Urine Test\u003C\u002Fsection_header\u003E\u003Csection_text\u003E\u003Cp\u003E\u003Cspan\u003EYour doctor can also test the amount of magnesium in your urine. A magnesium urine test isn't the normal urine test you might be used to, where you pee into a cup at your doctor's office and they send only that sample for testing. A magnesium urine test usually involves collecting your pee over 24 hours This is because your levels may go up and down based on the foods you've eaten that day.\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003C\u002Fsection_text\u003E\u003Chighlights\u003E\u003C\u002Fhighlights\u003E\u003Cpull_quotes\u003E\u003C\u002Fpull_quotes\u003E\u003C\u002Fsection_group\u003E\u003Csection_group\u003E\u003Cpagebreak type=\"mobile\" order=\"6\" \u002F\u003E\u003Csection_header\u003EMagnesium Red Blood Cell Test\u003C\u002Fsection_header\u003E\u003Csection_text\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EThis test measures the levels of magnesium inside your red blood cells. It may be a more sensitive test for detecting low levels of magnesium than a regular magnesium blood test. \u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EJust like a magnesium blood test, a technician takes a vial of blood from a vein in your arm and sends it to a lab for testing. \u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003C\u002Fsection_text\u003E\u003Chighlights\u003E\u003C\u002Fhighlights\u003E\u003Cpull_quotes\u003E\u003C\u002Fpull_quotes\u003E\u003C\u002Fsection_group\u003E\u003Csection_group\u003E\u003Csection_header\u003EMagnesium EXA Test\u003C\u002Fsection_header\u003E\u003Csection_text\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EFor this test, your doctor gently swipes the inside of your cheeks to gather cells that they then wipe on a test strip. The test strip goes to a lab for analysis. \u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EAt the lab, an electron microscope scans the cells and sends \u003C\u002Fspan\u003E\u003Ca class=\"\" link_friendlyurl=\"https:\u002F\u002Fwww.webmd.com\u002Fa-to-z-guides\u002Fwhat-is-x-ray\" id=\"4899a8e2-d0f7-4212-9610-34f839abdced;medical_reference\"\u003EX-rays\u003C\u002Fa\u003E\u003Cspan\u003E through them. Different minerals in your cells release different amounts of energy. The test can see how much magnesium you have based on these readings. \u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003C\u002Fsection_text\u003E\u003Chighlights\u003E\u003C\u002Fhighlights\u003E\u003Cpull_quotes\u003E\u003C\u002Fpull_quotes\u003E\u003C\u002Fsection_group\u003E\u003Csection_group\u003E\u003Cpagebreak type=\"desktop\" order=\"4\" \u002F\u003E\u003Csection_header\u003ETakeaways\u003C\u002Fsection_header\u003E\u003Csection_text\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EMagnesium is an essential mineral your body needs for multiple functions, such as energy production, making protein, helping muscles contract, and maintaining healthy bones and a healthy heart. You can get it from foods such as green leafy vegetables, \u003C\u002Fspan\u003E\u003Ca class=\"\" link_friendlyurl=\"https:\u002F\u002Fwww.webmd.com\u002Fdiet\u002Fhealth-benefits-of-whole-grain-pasta\" id=\"d92c07bf-1245-4126-bc51-6c3cb7dc0a23;medical_reference\"\u003Ewhole grains\u003C\u002Fa\u003E\u003Cspan\u003E, beans, and nuts.\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EMost people get enough magnesium from a well-balanced diet, but certain conditions can raise or lower your levels. Having too much or too little magnesium causes certain symptoms, some of which can be serious. Your doctor can do tests to find out what your magnesium levels are.\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003C\u002Fsection_text\u003E\u003Chighlights\u003E\u003C\u002Fhighlights\u003E\u003Cpull_quotes\u003E\u003C\u002Fpull_quotes\u003E\u003C\u002Fsection_group\u003E"},"citations":{"#cdata-section":"\u003Cp\u003ESOURCES:\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003ENational Institutes of Health Office of Dietary Supplements: “Magnesium.”\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EHarvard T.H. Chan School of Public Health: “Magnesium.”\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EUniversity Hospitals: “The Surprising Health Benefits of Magnesium.”\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EMount Sinai: “Magnesium.”\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EAcademy of Nutrition and Dietetics: “What is Magnesium?”\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EMedlinePlus: “Magnesium Blood Test.”\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EHouston Methodist: “Magnesium Deficiency: Symptoms, Causes & How to Test for It.”\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003ECleveland Clinic: “Hypomagnesemia.”\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003EStatPearls: “Hypermagnesemia.”\u003C\u002Fspan\u003E\u003C\u002Fp\u003E\u003Cp dir=\"ltr\"\u003E\u003Cspan\u003ENutritional Magnesium Association: “Magnesium Testing.”\u003C\u002Fspan\u003E\u003C\u002Fp\u003E"},"related_links_header":"","related_links_text":{"#cdata-section":""}}}}}},"staticPublicPath":"\u002Fstatic_vue\u002F091e9c5e81e4870f\u002Fclient\u002F","isInteractivePage":false},"flow":{"flowInfo":false},"quiz":{"rmq":{}}}</script> <script>window.__INITIAL_STATE__.route.hash = window.location.hash; window.__INITIAL_STATE__.route.fullPath = window.location.pathname; window.__INITIAL_STATE__.route.path = window.location.pathname; if(window.location.search !== ""){ var search = window.location.search.substring(1); window.__INITIAL_STATE__.route.query=JSON.parse('{"' + search.replace(/&/g, '","').replace(/=/g,'":"') + '"}', function(key, value) { return key===""?value:decodeURIComponent(value) }) } else {window.__INITIAL_STATE__.route.query={};}</script><script>try{var _comscore=_comscore||[];_comscore.push({c1:'2',c2:'6035829',options:{enableFirstPartyCookie:!0}}),function(){var e=document.createElement('script'),o=document.getElementsByTagName('script')[0];e.async=!0,e.src='https://sb.scorecardresearch.com/cs/6035829/beacon.js',o.parentNode.insertBefore(e,o),window.__INITIAL_STATE__?window.document.addEventListener('before_pv',function(){window.document.addEventListener('onAdobeOmniBeforePv',function(){window.biConsumerIsReady&&self.COMSCORE&&COMSCORE.beacon({c1:'2',c2:'6035829',options:{enableFirstPartyCookie:!0}})})},{once:!0}):window.document.addEventListener('onAdobeOmniBeforePv',function(){self.COMSCORE&&COMSCORE.beacon({c1:'2',c2:'6035829',options:{enableFirstPartyCookie:!0}})})}()}catch(e){}</script><noscript><img src='https://sb.scorecardresearch.com/p?c1=2&c2=6035829&cv=3.9.1&cj=1'></noscript>  <script id="cookieConsentScriptNonEU" async="async" src="https://img.lb.wbmdstatic.com/webmd_static_vue/file-explorer/webmd/consumer_assets/site_images/webmd-ccm/webmd-ccm-lite.min.js"></script><script type="text/javascript" async="async" importance="high" src="https://securepubads.g.doubleclick.net/tag/js/gpt.js" id="GPT_JS"></script><script>window.webmd.googleloaded = true; window.googleloaded = true; </script> <script>window.performance.mark('page-end');</script> <link rel="stylesheet" href="//img.lb.wbmdstatic.com/webmd_static_vue/091e9c5e81e4870f/client/css/non-critical-1732570847611.f64d91a6.css"> <link rel="stylesheet" href="//img.lb.wbmdstatic.com/webmd_static_vue/091e9c5e81e4870f/client/css/pagetype-oncology-1732570847611.b84c3554.css"> </body> </html>