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Unified Medical Language System® (UMLS®)

2012AB NCBI Taxonomy Source Information


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Source Number of shared concepts
out of 813114 from NCBI2012_04_16
Percentage Overlap
SNOMEDCT_2012_07_31 18612 2.3
SCTSPA_2012_04_30 18458 2.3
SNMI98 10007 1.2


  • Source overlap provides a high level comparison of content and meaning between the reported source and other sources in the Metathesaurus.
  • The report displays source overlap of 1% or greater.
  • Number of shared concepts: number of concepts that contain at least one atom from each of two compared sources.
  • Percentage Overlap: percentage of shared concepts relative to the total number of concepts for this source.