CINXE.COM
MedlinePlus: Guidelines for Links
<!DOCTYPE html> <html lang="en" id="about" class="nojs us" data-root="https://medlineplus.gov/"> <head> <meta charset="utf-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" /> <meta http-equiv="window-target" content="_top" /> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> <link rel="canonical" href="https://medlineplus.gov/about/using/criteria/" /> <link rel="alternate" hreflang="en" href="https://medlineplus.gov/about/using/criteria/" /> <link rel="alternate" hreflang="es" href="https://medlineplus.gov/spanish/acercade/uso/criterios/" /> <meta name="ac-dictionary" content="medlineplus-ac-dictionary" /> <meta name="description" content="MedlinePlus links to health information from U.S. federal government agencies and selected other websites. Become familiar with MedlinePlus selection criteria." /> <link rel="shortcut icon" href="https://medlineplus.gov/images/favicon.ico" type="image/x-icon" /> <link rel="apple-touch-icon" href="https://medlineplus.gov/images/touch-icon.png" /> <meta property="fb:app_id" content="1042245625821448" /> <meta property="og:title" content="MedlinePlus: Guidelines for Links" /> <meta property="og:url" content="https://medlineplus.gov/about/using/criteria/" /> <meta property="og:image" content="https://medlineplus.gov/images/mplus_fb.jpg" /> <meta property="og:description" content="MedlinePlus links to health information from U.S. federal government agencies and selected other websites. Become familiar with MedlinePlus selection criteria." /> <meta name="twitter:card" content="summary_large_image" /> <meta name="twitter:site" content="@medlineplus" /> <meta name="twitter:creator" content="@medlineplus" /> <meta name="twitter:title" content="MedlinePlus: Guidelines for Links" /> <meta name="twitter:description" content="MedlinePlus links to health information from U.S. federal government agencies and selected other websites. Become familiar with MedlinePlus selection criteria." /> <meta name="twitter:image" content="https://medlineplus.gov/images/mplus_fb.png" /> <meta name="twitter:image:alt" content=""/> <meta property="og:image:alt" content="" /> <title>MedlinePlus: Guidelines for Links</title> <link rel="stylesheet" href="https://medlineplus.gov/css/common_new.css?1732338403814" /> <!--[if IE 8]> <link rel="stylesheet" href="https://medlineplus.gov/css/ie8/common.css"> <![endif]--> <link rel="stylesheet" href="https://medlineplus.gov/uswds/css/uswds_styles.css" /> <link rel="stylesheet" href="https://medlineplus.gov/utilities/lostatic.css"> <script type="text/javascript">document.getElementsByTagName('html')[0].className = document.getElementsByTagName('html')[0].className.replace( /(?:^|\s)nojs(?!\S)/g , '').trim();</script> <script src="https://medlineplus.gov/uswds/js/uswds-init.min.js" type="text/javascript"></script> <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0], j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src= 'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f); })(window,document,'script','dataLayer','GTM-MMVM77');</script> </head> <body> <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-MMVM77" height="0" width="0" style="display:none;visibility:hidden" title="googletagmanager"></iframe></noscript> <a name="top" id="top"></a> <a class="hide-offscreen" href="#start">Skip navigation</a> <section class="usa-banner" aria-label="Official website of the United States government" > <div class="usa-accordion"> <header class="usa-banner__header"> <div class="usa-banner__inner"> <div class="grid-col-auto"> <img aria-hidden="true" class="usa-banner__header-flag" src="https://medlineplus.gov/uswds/img/us_flag_small.png" alt="" /> </div> <div class="grid-col-fill tablet:grid-col-auto" aria-hidden="true"> <p class="usa-banner__header-text"> An official website of the United States government </p> <p class="usa-banner__header-action">Here鈥檚 how you know</p> </div> <button type="button" class="usa-accordion__button usa-banner__button" aria-expanded="false" aria-controls="gov-banner-default-default" > <span class="usa-banner__button-text">Here鈥檚 how you know</span> </button> </div> </header> <div class="usa-banner__content usa-accordion__content" id="gov-banner-default-default" > <div class="grid-row grid-gap-lg"> <div class="usa-banner__guidance tablet:grid-col-6"> <img class="usa-banner__icon usa-media-block__img" src="https://medlineplus.gov/uswds/img/icon-dot-gov.svg" role="img" alt="" aria-hidden="true" /> <div class="usa-media-block__body"> <p> <strong>Official websites use .gov</strong><br />A <strong>.gov</strong> website belongs to an official government organization in the United States. </p> </div> </div> <div class="usa-banner__guidance tablet:grid-col-6"> <img class="usa-banner__icon usa-media-block__img" src="https://medlineplus.gov/uswds/img/icon-https.svg" role="img" alt="" aria-hidden="true" /> <div class="usa-media-block__body"> <p> <strong>Secure .gov websites use HTTPS</strong><br />A <strong>lock</strong> ( <span class="icon-lock" ><svg xmlns="http://www.w3.org/2000/svg" width="52" height="64" viewBox="0 0 52 64" class="usa-banner__lock-image" role="img" aria-labelledby="banner-lock-description-default" focusable="false" > <title id="banner-lock-title-default">Lock</title> <desc id="banner-lock-description-default">Locked padlock icon</desc> <path fill="#000000" fill-rule="evenodd" d="M26 0c10.493 0 19 8.507 19 19v9h3a4 4 0 0 1 4 4v28a4 4 0 0 1-4 4H4a4 4 0 0 1-4-4V32a4 4 0 0 1 4-4h3v-9C7 8.507 15.507 0 26 0zm0 8c-5.979 0-10.843 4.77-10.996 10.712L15 19v9h22v-9c0-6.075-4.925-11-11-11z" /> </svg> </span >) or <strong>https://</strong> means you鈥檝e safely connected to the .gov website. Share sensitive information only on official, secure websites. </p> </div> </div> </div> </div> </div> </section> <div id="mplus-wrap"> <header> <div id="mplus-header"> <div id="mplus-orgs"> <a href="https://www.nih.gov/" class="nih-org" target="_blank" title="National Institutes of Health"> <img class="nihlogo" src="https://medlineplus.gov/images/nihlogo.png" alt="National Institutes of Health"/> </a><a href="https://www.nlm.nih.gov/" target="_blank"> National Library of Medicine</a> </div> <div id="mplus-logo" class="years-25"> <a href="https://medlineplus.gov/"> <img alt="MedlinePlus Trusted Health Information for You" title="MedlinePlus Trusted Health Information for You" src="https://medlineplus.gov/images/m_logo_25.png"/> </a> </div> <div id="mplus-nav"> <div aria-live="polite" class="sm-live-area hide-offscreen"></div> <button id="sm-menu-btn" class="navmenu-btn" title="Menu" role="button" aria-controls="mplus-menu-list" type="submit">Menu<span class="icon icon-nav-menu"></span></button> <ul id="mplus-menu-list" class="nav-list"> <li><a href="https://medlineplus.gov/healthtopics.html">Health Topics</a></li> <li><a href="https://medlineplus.gov/druginformation.html">Drugs & Supplements</a></li> <li><a href="https://medlineplus.gov/genetics/">Genetics</a></li> <li><a href="https://medlineplus.gov/lab-tests/">Medical Tests</a></li> <li><a href="https://medlineplus.gov/encyclopedia.html">Medical Encyclopedia</a></li> <li><a href="https://medlineplus.gov/about/">About MedlinePlus</a></li> </ul><button id="sm-search-btn" class="navmenu-btn" title="Search" role="button" aria-controls="mplus-search" type="submit"><span class="hide-offscreen"></span>Search<span class="icon icon-nav-search"></span></button> <div class="top-1"> <form id="mplus-search" method="get" action="https://vsearch.nlm.nih.gov/vivisimo/cgi-bin/query-meta" title="Search MedlinePlus" target="_self"> <input type="hidden" name="v:project" value="medlineplus"/> <input type="hidden" name="v:sources" value="medlineplus-bundle"/> <div class="form-box text-combo"> <div class="form-area"><label class="hide-offscreen" for="searchtext_primary">Search MedlinePlus</label> <input id="searchtext_primary" class="form-text" type="text" placeholder="Search MedlinePlus" alt="#Site Search input" title="Site Search input" maxlength="400" size="40" name="query" autocomplete="off" role="textbox" aria-autocomplete="list" aria-haspopup="true"/> </div> <div class="button-area"> <button class="form-btn" title="Search MedlinePlus" alt="Search MedlinePlus" type="submit">GO</button> </div> </div> </form> <div class="secondarynav"> <ul class="nav-list"> <li><a href="https://medlineplus.gov/about/"><span>About MedlinePlus</span></a></li> <li><a href="https://medlineplus.gov/whatsnew/">What's New</a></li> <li><a href="https://medlineplus.gov/sitemap.html"><span>Site Map</span></a></li> <li><a href="https://support.nlm.nih.gov/knowledgebase/category/?id=CAT-01231&category=medlineplus&from=https%3A//medlineplus.gov/about/using/criteria/" target="_blank"><span>Customer Support</span></a></li> </ul> </div> </div> <div id="mplus-nav-bar"> <ul class="nav-list"> <li><a href="https://medlineplus.gov/healthtopics.html">Health Topics</a></li><li><a href="https://medlineplus.gov/druginformation.html">Drugs & Supplements</a></li><li><a href="https://medlineplus.gov/genetics/">Genetics</a></li><li><a href="https://medlineplus.gov/lab-tests/">Medical Tests</a></li><li><a href="https://medlineplus.gov/encyclopedia.html">Medical Encyclopedia</a></li> </ul> </div> <a id="mplus-lang-toggle" href="https://medlineplus.gov/spanish/acercade/uso/criterios/" title="Espa帽ol">Espa帽ol</a> </div> </div> </header> <div id="mplus-content"> <div id="breadcrumbs"> <div itemprop="breadcrumb" itemscope="" itemtype="http://schema.org/BreadcrumbList"> <span class="hide-offscreen">You Are Here:</span> <div itemscope itemprop="itemListElement" itemtype="http://schema.org/ListItem"> <a href="https://medlineplus.gov/" itemprop="item"><span itemprop="name">Home</span></a> → <meta itemprop="position" content="1"/> </div> <div itemscope itemprop="itemListElement" itemtype="http://schema.org/ListItem"> <a href="https://medlineplus.gov/about/" itemprop="item"><span itemprop="name">About MedlinePlus</span></a> → <meta itemprop="position" content="2"/> </div> <div itemscope itemprop="itemListElement" itemtype="http://schema.org/ListItem"> <a href="https://medlineplus.gov/about/using/" itemprop="item"><span itemprop="name">Using MedlinePlus</span></a> → <meta itemprop="position" content="3"/> </div> <div> <span>Guidelines for Links</span> </div> </div> </div> <span class="page-url print-only">URL of this page: https://medlineplus.gov/about/using/criteria/</span> <div > <article> <div class="page-info"> <div class="page-title"> <a name="start" id="start"></a> <h1>Guidelines for Links</h1> </div> <div class="page-actions"></div> <noscript><span class="js-disabled-message">To use the sharing features on this page, please enable JavaScript.</span></noscript> </div> <div class="main-one"> <section><div class="mp-content"><p><a href="https://medlineplus.gov/about/">MedlinePlus</a> is a website with high-quality health information that is easy to understand. It includes links from the National Library of Medicine, the National Institutes of Health, and other U.S. federal government agencies.</p> <p>MedlinePlus also links to selected non-government websites. Staff decides whether to link to a given resource using the following criteria as a guide:</p> <h2>Website Content</h2> <ul class="bulletlist"> <li>The website offers a description of the organization, including its mission, structure, governance, and policies. The organization's mission must align with the mission of MedlinePlus to provide accurate health information and the intended audience of MedlinePlus (patients and their families and friends).</li> <li>The organization provides accurate, science-based information that complements or enhances the health information found on MedlinePlus.</li> <li>The source of the content is trustworthy and transparent. The organization publishes a list of advisory board members or consultants with health-related expertise.</li> <li>The primary purpose of the website is educational, and the information is unbiased. MedlinePlus does not link to websites whose purpose is to sell or promote a product, service, or belief.</li> <li>The information provided is easy to understand, easy to navigate, and well organized.</li> <li>The website has original content. MedlinePlus will not link to pages that were reproduced from other websites.</li> <li>The website links only to reliable sources that meet MedlinePlus guidelines for links or other clearly stated guidelines established by the website. Links are properly maintained.</li> </ul> <h2>Website Advertising</h2> <ul class="bulletlist"> <li>Preference is given to pages with no advertising. In the few cases where MedlinePlus links to a page with advertising, the advertising must not suggest commercial influence on the health content.</li> <li>If the website has advertising, it displays an advertising policy. There must be a clear separation between educational content and advertising or sponsorship. Advertisers or sponsors must not play a role in selecting or editing health information.</li> <li>MedlinePlus will not link to organizations and web resources whose presentation or content suggests or implies that MedlinePlus endorses the products or services.</li> </ul> <h2>Website Availability and Maintenance</h2> <ul class="bulletlist"> <li>The website is consistently available.</li> <li>The website includes contact information for customer support or staff who maintain the website.</li> <li>Information is current. In most cases, this means that a last updated or last reviewed date is included.</li> <li>The website does not require users to register (even if registration is free), become a member of the organization, or pay a fee to view health information.</li> </ul> <h2>Videos</h2> <p>In addition to the criteria for websites listed above, videos should meet these guidelines:</p> <ul class="bulletlist"> <li>Videos are in a format that is playable on most desktop and mobile devices.</li> <li>Videos do not auto-play when a webpage is opened.</li> <li>Videos do not have flashing lights or strobe effects.</li> <li>Preference is given to videos that include closed captioning or transcripts, and on-screen text or graphics that don't overlap with captioning.</li> </ul> <h2>User Privacy</h2> <ul class="bulletlist"> <li>If a website collects personal information using email, forms, or surveys, it clearly displays a privacy policy that explains how information collected from users remains private and confidential.</li> <li>If a website displays advertising, it should prevent advertisers and sponsors from collecting any personally identifiable information from users.</li> </ul></div> </section> </div> </article> </div> </div> <footer> <div id="mplus-footer"> <div class="footer1"> <ul class="secondarynav"> <li><a href="https://medlineplus.gov/about/">About MedlinePlus</a></li> <li><a href="https://medlineplus.gov/whatsnew/">What's New</a></li> <li><a href="https://medlineplus.gov/sitemap.html">Site Map</a></li> <li><a href="https://support.nlm.nih.gov/knowledgebase/category/?id=CAT-01231&category=medlineplus&from=https%3A//medlineplus.gov/about/using/criteria/" target="_blank"><span>Customer Support</span></a></li> </ul> <ul class="follow-footer"> <li> <a href="https://medlineplus.gov/rss.html" class="follow-item">Subscribe to RSS<img src="https://medlineplus.gov/images/feed.png" class="social-media-toolkit-icon" alt="RSS" title="RSS"></a> </li> <li> <span class="follow-label">Follow us</span> <a href="https://twitter.com/medlineplus" class="follow-item" target="_blank"> <img src="https://medlineplus.gov/images/i_share_twitter.png" class="follow-icon" alt="X" title="X"> </a> <a href="https://facebook.com/Mplus.gov/" class="follow-item" target="_blank"> <img src="https://medlineplus.gov/images/i_share_fb.png" class="follow-icon" alt="Facebook" title="Facebook"> </a> <a href="https://www.instagram.com/mplusgov/" class="follow-item" target="_blank"> <img src="https://medlineplus.gov/images/Instagram_Glyph_Gradient_RGB.png" class="follow-icon" alt="Instagram" title="Instagram"> </a> </li> <li> <a href="https://medlineplus.gov/social-media-toolkit/" class="social-media-toolkit-item">Social Media Toolkit<img src="https://medlineplus.gov/images/i_social_media_toolkit.png" class="social-media-toolkit-icon" alt="Social Media Toolkit" title="Social Media Toolkit"></a> </li> </ul> </div> <div class="footer2"> <ul> <li><a href=" https://www.nlm.nih.gov/web_policies.html" target='_blank'>NLM Web Policies</a></li> <li><a href="https://medlineplus.gov/about/using/usingcontent/" >Copyright</a></li> <li><a href="https://medlineplus.gov/accessibility.html">Accessibility</a></li> <li><a href="https://medlineplus.gov/about/using/criteria/">Guidelines for Links</a></li> <li><a href="https://medlineplus.gov/plugins.html">Viewers & Players</a></li> <li><a href="https://www.hhs.gov/vulnerability-disclosure-policy/index.html" target="_blank">HHS Vulnerability Disclosure</a></li> <li><a href="https://medlineplus.gov/medlineplus-connect/">MedlinePlus Connect for EHRs</a></li> <li><a href="https://medlineplus.gov/about/developers/">For Developers</a></li> </ul> <div class="address"> <a href="https://www.nlm.nih.gov" target="_blank">National Library of Medicine</a> <span>8600 Rockville Pike, Bethesda, MD 20894</span> <a href="https://www.hhs.gov" target="_blank">U.S. Department of Health and Human Services</a> <a href="https://www.nih.gov" target="_blank">National Institutes of Health</a> </div> <div class="date"> </div> <div class="return-top"><a href="#top" title="Return to top"><img class="return-top-icon" alt="Return to top" src="https://medlineplus.gov/images/return-top.png"></a></div> </div> </div> </footer> </div> <script src="https://medlineplus.gov/jslib/jquery-3.6.0.min.js" type="text/javascript"></script> <script src="https://medlineplus.gov/jslib/mplus-frontend-controls-new.js" type="text/javascript"></script> <script src="https://medlineplus.gov/jslib/mplus-share.js?id=1112022" type="text/javascript"></script> <!--[if lte IE 9]><script src="//www.nlm.nih.gov/medlineplus/jslib/jquery.placeholder.js" type="text/javascript"></script><![endif]--> <script src="https://medlineplus.gov/jslib/control.js" type="text/javascript"></script> <script src="https://medlineplus.gov/uswds/js/uswds.min.js" type="text/javascript"></script> </body> </html>