If you’ve had unprotected sex, you might be wondering how soon you should get tested for a sexually transmitted infection (STI).
It can be tempting to test straight away for reassurance, but some infections take time to show up on a test. This is known as the window period, the time between coming into contact with an infection and when a test can reliably detect it.
Testing too early could mean an infection isn’t picked up, even if you have one.
So, when should I test?
The right time to test depends on the STI and the type of test being used.
As a general guide:
Chlamydia and gonorrhoea
These infections can usually be tested for around two weeks after sexual contact.
HIV
The window period depends on the type of HIV test used. Some tests can reliably detect HIV sooner than others, so it’s important to follow the advice provided with your test or speak to a sexual health professional about when to test.
Syphilis
Syphilis can take longer to show up on a blood test. You may be advised to test several weeks after sexual contact or to repeat a test depending on when the contact happened.
Because testing methods and individual circumstances can vary, a sexual health professional can advise you on the most appropriate time to test.
What if I have symptoms?
Don’t wait for the window period to pass if you develop symptoms.
Symptoms of an STI can include unusual discharge, pain when urinating, sores or blisters, unusual bleeding, itching or pain around the genitals.
Contact a sexual health service for advice if you notice anything unusual. They can assess your symptoms and advise you about testing and treatment.
It’s also important to remember that many STIs have no symptoms at all, which is why testing can be worthwhile even when you feel completely well.
What if I test too early?
Testing early doesn’t necessarily mean the result is useless, but you may need another test once the appropriate window period has passed.
If you’re unsure, tell the sexual health service when the sexual contact happened. This will help them advise you on whether to test now or wait a little longer.
Don’t forget about pregnancy and HIV prevention
If there is a possibility of pregnancy following unprotected sex, emergency contraception is time-sensitive, so don’t wait until it’s time for an STI test before seeking advice.
There is also medication called PEP (post-exposure prophylaxis) which may help prevent HIV following a possible exposure. PEP needs to be started as soon as possible and within 72 hours, so seek urgent advice if you think you may have been exposed to HIV.
Getting tested is a normal part of looking after your health
Having an STI test doesn’t mean you’ve done anything wrong. Testing is simply one way of looking after yourself and your sexual partners.
The most important thing is getting the right test at the right time.
Suffolk Sexual Health Service provides free and confidential STI testing, advice and support. If you’re unsure when you should test, our team can help you work out what’s right for you.
Visit the Suffolk Sexual Health Service website to find out more about STI testing and how to access support.
