PubMed is a free online database of references on life sciences.[1] It was established in January 1996.[2] The United States National Library of Medicine (NLM) at the National Institutes of Health (NIH) maintains the database.[1]

Each record in the PubMed database is assigned a special number to identify it.[1] This is the PMID, an acronym for "PubMed IDentifier" number.[3] PMIDs do not change over time and they are never reused.[4] Any PMID is only a number. The PMID tells the reader nothing about the type or quality of the content of any publication.


  1. 1.0 1.1 1.2 U.S. National Center for Biotechnology Information (NCBI), PubMed Help; retrieved 2012-1-27.
  2. "PubMed Celebrates its 10th Anniversary". Technical Bulletin. United States National Library of Medicine. 2006-10-05. Retrieved 2011-03-22.
  3. Mount Sinai School of Medicine, "What is a PubMed ID (PMID)?; retrieved 2012-1-27.
  4. NCBI, PubMed Help, FAQS PMID [PMID]; retrieved 2012-1-27.
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