References UK clinical guidance from the NHS, the British HIV Association (BHIVA), and the British Association for Sexual Health and HIV (BASHH). Last updated: April 2026.
Yes, you can test for most STIs while on your period. Urine tests, blood tests and throat swabs are unaffected by menstruation. Vaginal swabs can still be collected during a period, though some women prefer to wait. If you have symptoms or urgent concerns, don’t delay testing because of menstruation.
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Testing During Your Period
| Test Type | Affected by Period? |
|---|---|
| Urine test (chlamydia, gonorrhoea) | No |
| Blood test (HIV, syphilis, hepatitis) | No |
| Throat swab | No |
| Rectal swab | No |
| Vaginal swab | Usually fine; some labs prefer non-menstrual |
When to Test Regardless
- Symptoms present
- Urgent concern (PEP needed within 72 hours)
- Partner tested positive
- Blood tests and urine are always fine
If You Prefer to Wait
Some home test kits suggest waiting until after your period for vaginal swabs. If that’s more comfortable, wait a few days — but don’t delay significantly if you’re worried.
Read more: When to test | Home STI tests | When to get tested
Frequently Asked Questions
Will my period affect test accuracy?
Generally no. Blood in a vaginal swab rarely affects NAAT results.
Can I do a urine test on my period?
Yes — urine tests are unaffected.
Should I tell the clinic I’m on my period?
Yes, but they’ll usually proceed with testing.
Related reading
- Lab-Based Vaginitis Test
- Blood Test for Syphilis, Hepatitis B and Hepatitis C
- Can You Have Chlamydia and Test Negative?
- Does a Vaginal Yeast Infection Smell?
- Hepatitis B Core Antibody Test Explained
Sources
- NHS — Sexual health conditions
- BASHH — UK clinical guidelines for STI management
- British HIV Association (BHIVA) — HIV treatment guidelines
- Terrence Higgins Trust — sexual health information
- UK Health Security Agency — STI surveillance data
Steve Page is a recognised expert on Sexually Transmitted Diseases (STDs) and STD treatments, having published numerous articles in peer-reviewed journals and presented his research at conferences around the world. He has an in-depth understanding of the latest medical research on STDs, and is an advocate for the development of new treatments and protocols to improve the health of those affected. In addition to his research, he has dedicated his career to understanding the causes and symptoms of STDs, as well as how to best treat those impacted.
