461 lines
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461 lines
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<title>The Unified Medical Language System (UMLS) </title>
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<h4 class="margin-bottom-0">Unified Medical Language System<small><sup>®</sup></small> (UMLS<small><sup>®</sup></small>)</h4>
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<li class="has-children is-open"><div class="acnav__label"> <i class="arrow up"></i><a class="active" href="/research/umls/new_users/online_learning/OVR_001.html"> Overview </a></div><ul class="acnav__list acnav__list--level2" style="list-style-type: none; display: block;"><li class="li nav-item"><a class="notactive nav-link link10112" href="/research/umls/new_users/online_learning/OVR_002.html">The Metathesaurus </a></li><li class="li nav-item"><a class="notactive nav-link link10123" href="/research/umls/new_users/online_learning/OVR_003.html">The Semantic Network</a></li><li class="li nav-item"><a class="notactive nav-link link10134" href="/research/umls/new_users/online_learning/OVR_004.html">SPECIALIST Lexicon and Lexical Tools </a></li><li class="li nav-item"><a class="notactive nav-link link10145" href="/research/umls/new_users/online_learning/OVR_005.html">The UMLS License Agreement </a></li><li class="li nav-item"><a class="notactive nav-link link10156" href="/research/umls/new_users/online_learning/OVR_006.html">The UMLS License Agreement Appendix 2 -- SNOMED CT Affiliate Licence Agreement </a></li></ul></li><li class="has-children"><div class="acnav__label"> <i class="arrow down"></i><a class="notactive" href="/research/umls/new_users/online_learning/Meta_001.html"> Metathesaurus </a></div><ul class="acnav__list acnav__list--level2" style="list-style-type: none; display: none;"><li class="li nav-item"><a class="notactive nav-link link10268" href="/research/umls/new_users/online_learning/Meta_002.html">Source Vocabularies</a></li><li class="li nav-item"><a class="notactive nav-link link10279" href="/research/umls/new_users/online_learning/Meta_003.html">Subsets</a></li><li class="li nav-item"><a class="notactive nav-link link102810" href="/research/umls/new_users/online_learning/Meta_004.html">Preferred Terms</a></li><li class="li nav-item"><a class="notactive nav-link link102911" href="/research/umls/new_users/online_learning/Meta_005.html">Unique Identifiers in the Metathesaurus</a></li><li class="li nav-item"><a class="notactive nav-link link1021012" href="/research/umls/new_users/online_learning/Meta_006.html">Metathesaurus Data Files </a></li></ul></li><li class="has-children"><div class="acnav__label"> <i class="arrow down"></i><a class="notactive" href="/research/umls/new_users/online_learning/SEM_001.html"> Semantic Network </a></div><ul class="acnav__list acnav__list--level2" style="list-style-type: none; display: none;"><li class="li nav-item"><a class="notactive nav-link link1031114" href="/research/umls/new_users/online_learning/SEM_002.html">Identifiers in the Semantic Network </a></li><li class="li nav-item"><a class="notactive nav-link link1031215" href="/research/umls/new_users/online_learning/SEM_003.html">Semantic Types</a></li><li class="li nav-item"><a class="notactive nav-link link1031316" href="/research/umls/new_users/online_learning/SEM_004.html">Semantic Relationships</a></li><li class="li nav-item"><a class="notactive nav-link link1031417" href="/research/umls/new_users/online_learning/SEM_005.html">Semantic Relationships at the Concept Level </a></li><li class="li nav-item"><a class="notactive nav-link link1031518" href="/research/umls/new_users/online_learning/SEM_006.html">Parent - Child (broader/narrower) Relationships </a></li></ul></li><li class="has-children"><div class="acnav__label"> <i class="arrow down"></i><a class="notactive" href="/research/umls/new_users/online_learning/LEX_001.html"> Lexical Tools </a></div><ul class="acnav__list acnav__list--level2" style="list-style-type: none; display: none;"><li class="li nav-item"><a class="notactive nav-link link1041620" href="/research/umls/new_users/online_learning/LEX_002.html">Lexical Entries</a></li><li class="li nav-item"><a class="notactive nav-link link1041721" href="/research/umls/new_users/online_learning/LEX_003.html">The Lexical Tools</a></li><li class="li nav-item"><a class="notactive nav-link link1041822" href="/research/umls/new_users/online_learning/LEX_004.html">Lexical Variant Generation (LVG)</a></li><li class="li nav-item"><a class="notactive nav-link link1041923" href="/research/umls/new_users/online_learning/LEX_005.html">The Norm Program</a></li><li class="li nav-item"><a class="notactive nav-link link1042024" href="/research/umls/new_users/online_learning/LEX_006.html">The Word Index Generator - Wordind</a></li></ul></li><li class="has-children"><div class="acnav__label"> <i class="arrow down"></i><a class="notactive" href="/research/umls/new_users/online_learning/UMLST_001.html"> UMLS Tools </a></div><ul class="acnav__list acnav__list--level2" style="list-style-type: none; display: none;"><li class="li nav-item"><a class="notactive nav-link link1052126" href="/research/umls/new_users/online_learning/UMLST_002.html">The UMLS Terminology Services (UTS)</a></li><li class="li nav-item"><a class="notactive nav-link link1052227" href="/research/umls/new_users/online_learning/UMLST_003.html">Searching with the UMLS Terminology Services</a></li><li class="li nav-item"><a class="notactive nav-link link1052328" href="/research/umls/new_users/online_learning/UMLST_004.html">MetamorphoSys</a></li><li class="li nav-item"><a class="notactive nav-link link1052429" href="/research/umls/new_users/online_learning/UMLST_005.html">Accessing MetamorphoSys</a></li><li class="li nav-item"><a class="notactive nav-link link1052530" href="/research/umls/new_users/online_learning/UMLST_006.html">When MetamorphoSys is Complete</a></li><li class="li nav-item"><a class="notactive nav-link link1052631" href="/research/umls/new_users/online_learning/UMLST_007.html">UMLS Community Page</a></li><li class="li nav-item"><a class="notactive nav-link link1052732" href="/research/umls/new_users/online_learning/UMLST_008.html">Sample Load Scripts and Data Model</a></li><li class="li nav-item"><a class="notactive nav-link link1052833" href="/research/umls/new_users/online_learning/UMLST_009.html">The Rich Release Format (RRF) Subset Browser</a></li></ul></li><li><a class="notactive" href="/research/umls/new_users/online_learning/glossary.html"> Glossary </a></li><li><a class="notactive" href="/research/umls/new_users/online_learning/faqs.html"> UMLS FAQs </a></li><li><a class="notactive" href="/research/umls/new_users/online_learning/HELP_001.html"> User Support </a></li><li><a class="notactive" href="/research/umls/new_users/online_learning/end.html"> Feedback </a></li><li><a class="notactive" href="//support.nlm.nih.gov/?style=classic&deptID=28054index.html"> Contact US </a></li>
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<h1>The Unified Medical Language System (UMLS) </h1>
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<p>The purpose of the National Library of Medicine Unified Medical Language System (UMLS) is to facilitate the development of computer systems that behave as if they "understand" the meaning of the language of biomedicine and health. The UMLS provides data for system developers as well as search and report functions for less technical users. </p>
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<p>There are three UMLS Knowledge Sources: </p>
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<li>The Metathesaurus, which contains over one million biomedical concepts from over 100 source vocabularies </li>
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<li>The Semantic Network, which defines 133 broad categories and
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fifty-four relationships between categories for labeling the biomedical domain </li>
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<li> The SPECIALIST Lexicon & Lexical Tools, which provide lexical information and programs for language processing </li>
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<p>They are distributed with flexible <a href="LEX_001.html">lexical tools</a> and <a href="UMLST_004.html">MetamorphoSys</a>, the UMLS install and customization program.</p>
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