QIS — A New Journal/Citation Subset Value for MEDLINE® Citations

A new value, QIS, has been established for the Journal/Citation subsets which display in the Subset [SB] field of the MEDLINE display format. The new value will be used on citations from non-Index Medicus journals in the field of the history of medicine. The value was established by NLM® because these journals require special processing. QIS is not a subset of Q; however, some journals previously designated as Q are now QIS. The Q subset value is used for citations in the field of the history of medicine and includes records from the former HISTLINE® database. To facilitate searching for history of medicine information, the history [sb] search strategy in PubMed was edited so that it retrieves the QIS citations along with the Q citations.

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