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PubMed: Other Useful Tools and Information

This guide helps users to learn how to use the new and updated PubMed and show them what the new features are and where to find some of the old features.

PubMed User Guide

PubMed User Guide & FAQs prepared by National Library of Medicine:

Single Citation Matcher

Single Citation Matcher is one of the popular tools people use in the legacy PubMed and it is still retained in the new PubMed, located at the bottom of the PubMed homepage where you also find other useful links such as Clinical Queries, Batch Citation Matcher, NLM Journals database, FAQ and Users Guide, etc. as shown below:

The Single Citation Matcher allows you to find a reference with partial information. Below is what the Single Citation Matcher looks like. You fill in the boxes with the information you have and let the system find the matching record. It is also a very convenient tool to verify a citation. 

Clinical Queries

Clinical Queries is a tool that was designed for clinician use and allow them to search for relevant clinical literature on etiology, diagnosis, therapy, prognosis, and clinical prediction guides and filtered in three clinical research areas: Clinical Study Categories, Systematic Reviews, and Medical Genetics within a broad or narrow scope.


PubMed vs. PubMed Central

PubMed vs PubMed Central

Please do not confuse PubMed with PubMed Central. They are two different kinds of databases:

  • PubMed is a bibliographic database of biomedical literature.
  • PubMed Central (PMC) is a fulltext repository used by researchers to deposit their final peer-reviewed journal article that is a result of NIH  funded research projects and that is accepted for publication to comply with NIH Public Access Policy. The content in PMC is searchable in PubMed. To learn more about how to comply with NIH Public Access Policy, please visit the NIH Public Access Policy Research Guide


  • PMID is the unique identifier assigned to each PubMed bibliographic record.
  • PMCID is the unique number assigned to each article deposited in the PubMed Central repository. It is the symbol of compliance with NIH Public Access Policy. Click here for a handout on PMID vs PMCID


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