Vancouver Citation Style: Guide for Medical Students

Vancouver style is the citation system used by most biomedical journals, including those indexed in PubMed. If you’re studying medicine, nursing, pharmacy, or any health science, you’ll likely need Vancouver referencing. The National Library of Medicine publishes the original sample references this style is based on, worth bookmarking if you run into an unusual source type this guide doesn’t cover.

How Vancouver Works

Vancouver is a numbered citation system, similar to IEEE:

• Sources are numbered in the order they first appear in the text
• In-text citations use superscript numbers or numbers in parentheses/brackets
• The reference list is ordered numerically, not alphabetically

In-Text Citation Styles

Superscript (most common in journals):

Recent studies have shown improved outcomes with early intervention.^1

Parentheses:

Recent studies have shown improved outcomes with early intervention (1).

Brackets:

Recent studies have shown improved outcomes with early intervention 1.

Your journal or institution will specify which format to use. Superscript is the most common in medical journals.

Multiple Citations

Several studies^1-4 have shown...

This finding is supported by multiple sources.^2,5,8

Reference List Format

Journal Article

For a cross-style breakdown of journal article citations, see our journal article citation guide.

1. Smith JD, Johnson MK. The impact of citation accuracy on academic publishing. J Acad Writing. 2025;15(3):45-62. doi:10.1234/example.

Key formatting rules:

• No periods in initials (Smith JD, not Smith J.D.)
• Abbreviated journal name (following MEDLINE/PubMed abbreviations)
• Year;Volume(Issue):Pages format with no spaces
• Up to 6 authors listed, then “et al.”

Journal Article with More Than 6 Authors

2. Smith JD, Johnson MK, Brown A, Wilson R, Taylor S, Lee P, et al. Title of article. J Name. 2025;15(3):45-62.

Book

3. Brown A. Academic writing: a complete guide. 3rd ed. London: Routledge; 2024.

Book Chapter

4. Wilson R. Citation practices across disciplines. In: Taylor S, Lee P, editors. Handbook of academic standards. Oxford: Oxford University Press; 2025. p. 112-34.

Website

5. World Health Organization. Global health statistics 2025 [Internet]. Geneva: WHO; 2025 [cited 2025 Mar 15]. Available from: https://www.who.int/statistics

Key points for websites:

• [Internet] after the title
• [cited YYYY Mon DD] for access date
• “Available from:” before the URL

Clinical Guideline

6. National Institute for Health and Care Excellence. Hypertension in adults: diagnosis and management. NICE guideline [NG136]. London: NICE; 2023.

Dataset

7. Boateng K. Urban heat island temperature readings for Accra, 2015-2024 [Dataset]. Version 2. Zenodo; 2024. Available from: https://doi.org/10.5281/zenodo.1234567

Key points:

• [Dataset] descriptor (one word) immediately follows the title – Vancouver and IEEE both use this single-word form, unlike APA and Harvard’s two-word “[Data set]”
• Version number follows the descriptor, not the title
• Semicolon separates repository and year, matching the journal-citation punctuation used throughout Vancouver

Preprint

8. Chidziva F. Anomalous thermal transport in layered antiferromagnets. arXiv. 2025 [Preprint].

Key points:

• [Preprint] descriptor at the end, replacing the volume/issue/page block a published article would carry
• No “Available from:” line needed when the preprint server itself is named as the source

Vancouver vs IEEE

Both are numbered systems, but they differ in important ways:

For the IEEE version, see our IEEE citation guide.

Using PubMed IDs

If you’re citing medical literature, PubMed makes it easy. Every article in PubMed has a PMID (PubMed ID) – a unique number you can use to look up the full citation. For a detailed walkthrough, see our guide on generating citations from PMIDs.

You can paste a PMID directly into CiteTools.io to generate a Vancouver-formatted citation automatically. Enter the number (e.g., 33657327) and select Vancouver as the output style.

Troubleshooting: Superscript, Parentheses, or Brackets?

Vancouver’s biggest source of confusion isn’t the reference list – it’s picking one in-text format and using it consistently for the whole paper. Word processors handle superscript differently:

• Microsoft Word: Select the number, press Ctrl+Shift+= (Cmd+Shift+= on Mac) to toggle superscript
• Google Docs: Select the number, press Ctrl+. (Cmd+. on Mac)
• LaTeX: Superscript citation numbers are handled automatically by citation packages like natbib or biblatex set to a numeric style – you don’t format them by hand

Whichever format your journal or department specifies, use it for every citation in the paper. Switching between superscript and parenthetical numbers mid-document is one of the more common Vancouver formatting slips, and it’s easy to miss when pasting text between drafts.

Worked Example: From In-Text Numbers to a Reference List

Suppose your discussion section cites three sources in this order: a journal article, a clinical guideline, and a dataset you analyzed directly.

Recent evidence supports early intervention in this population.^1 Current guidelines recommend a staged treatment protocol,^2 based partly on the temperature-exposure data set analyzed in this study.^3

The matching reference list entries, in the same numeric order:

1. Smith JD, Johnson MK. The impact of citation accuracy on academic publishing. J Acad Writing. 2025;15(3):45-62. doi:10.1234/example.
2. National Institute for Health and Care Excellence. Hypertension in adults: diagnosis and management. NICE guideline [NG136]. London: NICE; 2023.
3. Boateng K. Urban heat island temperature readings for Accra, 2015-2024 [Dataset]. Version 2. Zenodo; 2024. Available from: https://doi.org/10.5281/zenodo.1234567

If a later revision moves the guideline citation earlier, into the introduction, its number changes to match wherever it now first appears – and every source between its old and new position shifts too. Build your numbered reference list only once your citation order is final, not while you’re still revising the draft.

Common Mistakes

1. Periods in author initials – Vancouver uses “Smith JD” not “Smith J.D.”
2. Full journal names – Always use the abbreviated form from PubMed/MEDLINE
3. Alphabetizing the reference list – Vancouver orders by first appearance
4. Missing “et al.” for 7+ authors – List the first 6 authors, then “et al.”
5. Forgetting [Internet] and [cited] for online sources – Required for all web sources
6. Wrong page format – Use “p. 112-34” not “pp. 112-134” (note: truncated page numbers)
7. Switching in-text formats mid-paper – Pick superscript, parentheses, or brackets once and use it for every citation

Try It with CiteTools

Medical citations have strict formatting requirements. Paste any DOI, PubMed ID, or URL into CiteTools.io to get a correctly formatted Vancouver citation instantly. We pull metadata straight from PubMed to ensure accuracy.