How to Generate Citations from a PMID with CiteTools

If you work in medicine, nursing, public health, biology, or any health-related field, you've almost certainly encountered PubMed. It's the largest biomedical literature database in the world, and every article in it has a unique identifier called a PMID. That PMID is all you need to generate a perfectly formatted citation -- no manual data entry required.

What Is a PMID?

A PMID (PubMed Identifier) is a unique numerical ID assigned to every article indexed in the PubMed database. It's maintained by the National Library of Medicine (NLM) and is permanently associated with that specific article.

A PMID looks like this:

37648853

That's it -- just a number. No prefix, no URL structure. When you see it referenced in context, it usually appears as:

PMID: 37648853

PMIDs are assigned sequentially as articles are added to PubMed. The database contains over 36 million records dating back to the 1950s, covering biomedical and life sciences journals from around the world.

PMID vs. PMCID vs. DOI

These three identifiers often appear together on the same article, and students frequently confuse them. Here's how they differ:

PMID is a PubMed database index number. Every article in PubMed has one, but it only works within PubMed.

PMCID is a PubMed Central identifier. PMC is a free full-text archive, and only articles deposited there (often due to NIH funding mandates) get a PMCID. Not every article with a PMID has a PMCID.

DOI is a universal identifier that works across all publishers and databases. Most modern journal articles have both a PMID and a DOI. The DOI is what citation styles typically require in your reference list.

For more on how DOIs work in citations, see our guide to DOIs.

How to Find a PMID

On PubMed Directly

1. Go to PubMed
2. Search for the article by title, author, or keywords
3. Click on the article
4. The PMID is displayed below the abstract, alongside the PMCID and DOI if available

From a Citation or PDF

Many journal articles display the PMID in the article footer or header, especially in medical journals. Look for "PMID:" followed by a number, usually near the DOI.

From Google Scholar

Google Scholar doesn't display PMIDs directly, but if you click through to the PubMed version of an article (look for the "PubMed" link in search results), the PMID will be on the article page.

From a Reference List

If a colleague or professor shared a reference list with PMIDs, you already have what you need. The number itself is your key.

Generating a Citation from a PMID in CiteTools

Here's the step-by-step process:

Step 1: Copy Your PMID

Grab the PMID from PubMed or wherever you found it. You need only the number -- for example, 37648853. You can also use the full PubMed URL like https://pubmed.ncbi.nlm.nih.gov/37648853/.

Step 2: Paste It into CiteTools

Go to CiteTools.io and paste the PMID directly into the input field. CiteTools recognizes PMIDs automatically -- no need to specify that it's a PubMed identifier.

Step 3: Choose Your Citation Style

Select from APA, MLA, Chicago, Vancouver, IEEE, Harvard, or any other supported style. CiteTools fetches the article metadata (title, authors, journal, volume, issue, pages, DOI) from PubMed and formats it for you.

Step 4: Copy or Export

Copy the formatted citation to your clipboard, or export it as BibTeX, RIS, or LaTeX for your reference manager. For details on export options, see our export guide.

Example: From PMID to Citation

Let's say you're citing this article:

PMID: 37648853

CiteTools retrieves the metadata and produces:

APA:

Luo, R., Sun, L., Xia, Y., Qin, T., Zhang, S., Poon, H., & Liu, T.-Y. (2022). BioGPT: Generative pre-trained transformer for biomedical text generation and mining. Briefings in Bioinformatics, 23(6), bbac409. https://doi.org/10.1093/bib/bbac409

Vancouver:

Luo R, Sun L, Xia Y, Qin T, Zhang S, Poon H, Liu TY. BioGPT: Generative pre-trained transformer for biomedical text generation and mining. Brief Bioinform. 2022;23(6):bbac409. doi:10.1093/bib/bbac409

MLA:

Luo, Renqian, et al. "BioGPT: Generative Pre-Trained Transformer for Biomedical Text Generation and Mining." Briefings in Bioinformatics, vol. 23, no. 6, 2022, bbac409. https://doi.org/10.1093/bib/bbac409.

That's three properly formatted citations from a single number.

Batch Processing Multiple PMIDs

If you're building a reference list for a literature review or thesis, you probably have dozens of PMIDs. CiteTools supports batch processing -- paste multiple PMIDs (one per line or separated by commas) and get all your citations formatted at once.

This is especially useful when you've exported a list of PMIDs from a PubMed search. Rather than formatting each one manually, you can process them all in a single pass.

When to Use PMIDs vs. DOIs

Both PMIDs and DOIs can be used to generate citations in CiteTools, but they serve different purposes:

Use a PMID when:

• You're working primarily in PubMed
• The article is a biomedical or life sciences paper
• You have the PMID handy from a database search

Use a DOI when:

• The article is outside PubMed's scope (social sciences, humanities, engineering)
• You need the identifier for your citation (most styles require DOIs, not PMIDs)
• You want the most universal identifier

In practice, if you have either one, CiteTools will produce the same result. The tool resolves PMIDs to their full metadata through PubMed's API and includes the DOI in the formatted output when available.

Common Mistakes

Including the PMID in your citation. PMIDs are database identifiers, not citation elements. No major citation style (APA, MLA, Chicago, Vancouver, IEEE) requires a PMID in the reference entry. Use the DOI instead. The PMID is your lookup key; the DOI is what goes in the paper.

Confusing PMID with PMCID. If you accidentally use a PMCID (which starts with "PMC") where a PMID is expected, the lookup will fail or return the wrong result. Double-check which identifier you copied.

Assuming every PubMed article has a DOI. Older articles indexed in PubMed (especially pre-2000) may not have DOIs. In those cases, your citation will include the journal URL or simply end after the page numbers, depending on your style. CiteTools handles this automatically.

Using PMIDs for non-PubMed articles. PMIDs only exist for articles indexed in PubMed. If your source is from an engineering journal, a social sciences database, or a humanities publication, it likely doesn't have a PMID. Use the DOI or paste the full citation text instead.

Tips for Medical and Health Sciences Students

1. Save PMIDs as you search. When doing a PubMed search for your literature review, use the "Save" or "Send to Clipboard" feature to collect PMIDs as you go. This gives you a ready-made list for batch citation.
2. Use PubMed's citation export first, then reformat. PubMed can export citations in various formats, but they often need reformatting for your specific style. CiteTools handles the final formatting step.
3. Vancouver style is most common in medical writing. If you're writing for a medical journal or a health sciences course, Vancouver (numbered references) is probably your required style. CiteTools formats Vancouver citations with abbreviated journal titles per NLM conventions.
4. Check your institution's PMCID requirements. NIH-funded research often requires PMCID citations in progress reports. This is separate from your paper's reference list, but it's worth knowing the difference.

Try It with CiteTools

Stop typing out long author lists and journal abbreviations by hand. Paste your PMID -- or a batch of them -- into CiteTools.io and get correctly formatted citations in any style within seconds. We pull directly from PubMed's database, so you get accurate metadata every time.