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What Are Supplementary Concept Records?

MEDLINE indexers regularly come across substances in the literature that are not currently MeSH headings. When this happens, NLM staff adds these substances to the MeSH vocabulary as Supplementary Concept Records (SCRs). 

While MeSH headings are updated annually, new SCRs are added weekly.  You can see these in the MeSH Database and on PubMed records under Substances. This list of Substances includes both MeSH headings and SCRs.

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This video can be seen directly at //www.nlm.nih.gov/bsd/disted/drugs/videos/scrs.mp4

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