Answered By: Mary Kaye Hooker
Last Updated: Oct 16, 2018     Views: 26


Although they are interrelated, PubMed and PMC are two separate and unique resources. PubMed is a database of citations and abstracts for more than 26 million articles.

PMC is an archive of full-text journal articles. PMC contains over 3 million articles, most of which have a corresponding citation in PubMed.

For a comprehensive search, it is advisable to search PubMed and PMC separately for the following reasons:

  • PubMed searches only what appears in a PubMed record—citation and abstract. PubMed does not have citations for certain types of PMC material, such as book reviews, that are considered out of scope for PubMed.
  • In addition, some articles published prior to 1966 and added to PMC via the Back Issue Digitization project do not have corresponding citations in PubMed.

Also note that searches in PMC and in PubMed will generate separate search histories. For more information on the connection between PMC and PubMed, visit the PMC FAQs page.