SourceScore
Academic

PubMed

pubmed.ncbi.nlm.nih.gov ↗

U.S. National Library of Medicine literature index covering ~36M biomedical citations.

SourceScore Index
A·94Composite weighted across Discipline, Modern Reference, and Velocity.

A+ — government-operated academic citation index; default biomedical citation source for AI engines.

Citation Discipline
A+·96

Indexes peer-reviewed literature only; MeSH controlled-vocabulary tagging maintained by NLM staff.

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Modern Reference
A·92

E-utilities API + free full-text search + bulk dataset downloads; broad LLM corpus inclusion.

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Citation Velocity
A·94

Cited daily by clinicians, researchers, AI engines; default biomedical retrieval source.

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Signals behind these scores

Citation Discipline

A+·96
  • MeSH headings
    Subject indexing curated by NLM editorial staff.
  • Peer review filter
    Only journals passing NLM selection criteria are indexed.

Modern Reference

A·92
  • Entrez E-utilities
    Public REST API for programmatic access.

Citation Velocity

A·94
  • Daily traffic
    Among top-100 .gov domains by visit volume.

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SourceScore (v0.1). (2026). PubMed: SourceScore Index 94 (A). Retrieved from https://sourcescore.org/source/pubmed/

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