Window Period Calculator
When will your STI test results be accurate? Find out below!
Our STI Window Period Calculator helps you know when to test after possible exposure to an STI. Just enter the date of the sexual activity in question and see how long you should wait for an accurate STI test result.
When did the unprotected sexual activity take place?
This calculator is for informational use only; it is not a substitute for medical advice.
Have Questions About Window Periods?
- This calculator is for informational use only; it is not a substitute for medical advice.
- These window periods are based on the tests performed by Yoxly. Click here for more information on the STI tests that Yoxly performs.
- “Window period” refers to the period of time between being exposed to an infection and a test being able to reliably detect the presence or absence of that infection.
- The window periods used here are in line with national and international guidelines from BASHH, IUSTI, WHO, BHIVA and others.
- If you have symptoms that may be due to an STI, it is important to speak with a healthcare professional.
- If you are worried you have been exposed to HIV, and it is within 72 hours of exposure, speak with your local sexual health clinic or emergency department to discuss post-exposure prophylaxis following sexual exposure (PEPSE or PEP). Click here to find your nearest location.
- If you think you have been exposed to a specific STI (including HIV), it is important to speak with your local sexual health clinic.
- If you have used a barrier method of contraception (e.g. a condom) correctly and consistently, your risk of contracting an STI is reduced significantly.
- Yoxly only tests samples from the vagina or the penis. We do not currently test for infections in the oropharynx (mouth and throat) or rectum (bum). If you wish to test for STIs that may have been transmitted through receptive oral or anal sex, you should visit a sexual health clinic.
- If you have been sexually assaulted, we recommend speaking with your local Sexual Assault Referral Centre (SARC). You can find your local SARC (England) by clicking here. SARCs are also available in Scotland, Wales and Northern Ireland.
- It is important to consider the risk of pregnancy following unprotected sex. Emergency contraception is available from your local sexual health clinic, emergency department or pharmacy.