MEDLINE Updates

Every year the National Library of Medicine updates Medical Subject Headings (MeSH) and Substance Names on existing MEDLINE citations.

For a short period of time, starting in November, citations in PubMed will not be fully indexed. This means that searches conducted using the MeSH database could potentially miss more  citations than usual during that time. There will be an increase in the number of citations with the indicators of [PubMed in process] or [PubMed-as supplied by publisher].  Once the update is complete (approximately mid-December) indexed citations will be added to PubMed again.

To learn more go to:

Learn more about new descriptors and other changes:   Introduction to MeSH-2013.

Have more questions about MEDLINE or PubMed? Contact a Health Sciences librarian.

Call 215-707-4033 or use HSC Reference e-mail

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