Many sexually transmitted infections (STIs) do not show symptoms, and some can take time to be detected by a test, so it’s important to test – even if you don’t have any symptoms.
To ensure the most accurate result, it is important to wait until the appropriate testing window has passed:
- Chlamydia and Gonorrhoea: Wait at least 2 weeks after unprotected sex before testing.
- HIV: Wait 6 weeks (45 days) before testing, as this is the time needed for a reliable result.
- Syphilis: Wait 90 days before testing
This waiting period is known as the window period, which is the time between being exposed to an infection and it becoming detectable by a test.
Testing too early may result in a false negative result. If you are using a self-testing kit, remember to record the date you take your samples, as this helps us interpret your results accurately.
Please note, kits may take up to seven days to arrive at your home address from ordering.
Regular STI Testing
Chlamydia is the most commonly diagnosed STI in the UK and often causes no symptoms. If left untreated, it can lead to serious health complications.
If you are sexually active, we recommend having an STI test:
- At least once a year
- Whenever you change sexual partner(s)
- If you think you may have been exposed to an STI
For more information about the tests available and how to access them, visit our STI Testing page.
Self-test kits ordered through MyDSH are only available to Devon residents.

