See journal rankings on PubMed — SJR quartile and citation impact.

PubMed is run by the U.S. National Library of Medicine and stays deliberately neutral about journal prestige — it indexes everything that meets MEDLINE criteria, from Nature down to small regional journals. The search results page shows authors, year and venue, but no quartile, no impact factor, no "tier" signal.

For clinical researchers, systematic-review authors and pharma analysts that means a constant second step: copy the journal name, open another tab, look it up on SCImago or in an internal list. Journal Check eliminates that round-trip.

On pubmed.ncbi.nlm.nih.gov, every search result and abstract page exposes the journal's ISO abbreviation and, for most results, an article DOI. The extension picks up whichever is available and queries api.journal-check.com for the matching SJR record.

A coloured badge (Q1 / Q2 / Q3 / Q4) is then injected into the result row, right after the citation line. Hover it to see the numerical SJR value, the year of the data, and an OpenAlex citation-percentile fallback when SJR has no entry.

• SJR quartile — the dominant signal on PubMed, because almost every indexed biomedical journal is in SCImago.
• OpenAlex citation impact — used as a fallback for new or niche journals that haven't yet entered SJR.
• ABDC / FT50 / CORE — shown when relevant but rarely apply to biomedical venues.

SCImago publishes a new SJR edition every year, usually in May. Other extensions in this space froze in 2023 and still show 2022 quartiles — which materially affects ranking decisions, because quartiles do move. Journal Check re-pulls SJR every release cycle and publishes the refresh date on the homepage and in our public API.

The same approach runs on Google Scholar, arXiv and Semantic Scholar.