Biomedical indexing
PubMed vs MEDLINE vs PMC: what authors need to know
PubMed, MEDLINE and PubMed Central (PMC) are closely connected, but they are not the same thing. This distinction matters when a journal advertises itself as “PubMed indexed,” when an institution requires MEDLINE indexing, or when an article appears in PMC.
Maintained by the Beallslists.com editorial review team · Evidence reviewed: · Current verification cycle: 2026
The simplest difference
| Service | What it is | What authors should remember |
|---|---|---|
| PubMed | A search resource containing citations from MEDLINE, PMC and other NLM literature sources. | An article appearing in PubMed does not automatically mean the journal is MEDLINE indexed. |
| MEDLINE | NLM’s curated bibliographic database for life-sciences and biomedical journal literature. | MEDLINE status is a journal-level selection and indexing question that should be checked in NLM records. |
| PMC | A free full-text archive for biomedical and life-sciences literature. | Full-text presence in PMC is different from MEDLINE indexing. |
Why “PubMed indexed” can be confusing
PubMed brings together records from multiple NLM sources. A citation can therefore appear in PubMed even when it is not a MEDLINE-indexed citation. Some PMC content is also searchable through PubMed. That is why authors should ask a more precise question: What exactly is included, through which NLM route, and from what date?
How to check a journal properly
- Search the journal title or ISSN in the NLM Catalog.
- Confirm that the record matches the exact title and ISSN.
- Read the indexing/status information rather than relying only on the fact that the record exists.
- If MEDLINE status matters, confirm that the journal is indexed for MEDLINE and note the relevant coverage date.
- If PMC matters, check whether the journal participates in PMC and whether the article type you care about is actually deposited.
Common mistakes
“I found one article in PubMed, so the journal is MEDLINE indexed.”
Not necessarily. PubMed contains more than MEDLINE citations.
“The journal is in PMC, so it is the same as MEDLINE.”
No. PMC is a full-text archive; MEDLINE is a bibliographic database with a different selection and indexing role.
“The journal appears in NLM Catalog, therefore it is indexed.”
The NLM Catalog contains journal records for many purposes. Read the specific status shown in the record.
Which term should a journal use?
A journal should describe its status precisely. If its articles are discoverable through PMC, say so. If it is indexed for MEDLINE, say MEDLINE. Broad claims such as “PubMed indexed” can be misunderstood unless the journal explains what they mean.
Related verification guides
Official sources and further reading
- NLM PubMed User Guide — current NLM explanation of PubMed coverage, MEDLINE and PMC
- NLM Catalog — official NLM journal record lookup
Database coverage and journal policies can change. Verify important claims at the official source on the date you make your publication decision.