STD Test Window Period: How Soon Should You Test?

Gloved hand holding blood sample test tube labelled std test for screening during window period.

If you think you may have been exposed to a sexually transmitted infection (STI), it is important to know how soon you should get tested.

Each sexually transmitted disease (STD) has its own window period, and testing too early may give false reassurance. Knowing the window period for STI testing helps you to test at the right time, however, provides accurate results and allows for important treatment without delay if needed.

In Singapore, STD testing is especially important for young adults, given that those aged between 20 to 34 years had the highest rate of STIs in 2017 according to a Ministry of Health (MOH) report.

Bar chart showing chlamydia gonorrhoea syphilis genital warts and herpes STI cases in Singapore.

Source: National Skin Centre

What Is the STD Test Window Period?

The STD test window period is the time between when you are exposed to an infection and when a test can reliably detect it. During this period, your body may not yet show enough signs of the infection for the test to show a positive result.

Testing too early can sometimes lead to false negatives, which means an infection may go undetected if the test is done before the window period has passed.

STD Window Periods by Infection

STDs have different window periods, which can vary depending on the type of test used, the stage of infection, and individual immune responses. Below are general ranges for common infections:

STD	Window Period
Chlamydia and Gonorrhoea	1 to 6 days
Syphilis	3 to 6 weeks
Herpes	4 to 6 weeks
Hepatitis B	6 weeks
HIV	14 days

Disclaimer: These timeframes are general guidelines. If you are uncertain about when to test or think you may have been exposed to an STD, speak to a doctor for personalised advice and appropriate testing.

Can an STD Be Dormant and Not Show on Tests?

3D illustration of virus cell among red blood cells explaining std infection window period concept.

Some STDs can remain dormant, which means they stay in the body without causing any noticeable symptoms. This is different from the window period, where the infection is too new to be detected. Once the window period has passed, many dormant infections can still be identified through appropriate tests even if you feel completely well.

For example, herpes can lie inactive for long periods before flare-ups occur, and HPV may persist silently without symptoms. Regular screening, even without signs of infection, is important to detect and manage these conditions early.

Should I Get Retested After Treatment?

Retesting soon after treatment is not always required, but your doctor may advise it in certain cases to confirm that the infection has cleared. In addition, some people may be advised to test again later to check for reinfection, especially if there is ongoing risk such as an untreated partner or new sexual exposure.

The timing of retesting depends on the type of infection and your personal circumstances, so it is best to follow medical advice on whether and when to repeat a test.

Doctor writing notes during consultation with patient for possible std exposure and risk concerns.

What Should I Do Immediately After Possible Exposure?

If you believe you have been exposed to an STD, you should seek medical advice as soon as possible. A doctor can assess your situation, decide if any immediate steps are appropriate, and advise you on the best time for your first and follow-up tests.

How Should I Prepare for an STD Test?

Preparing for an STD test is usually straightforward, and most people do not need to take any special steps. In some cases, your doctor may give you specific instructions, such as avoiding urination shortly before a urine test or informing them about recent medications.

It is important to mention any symptoms or concerns you have, so the right tests can be arranged. Following your doctor’s advice ensures the results are as accurate as possible.

Find an STD Clinic / STD Testing Near Me

Orchard Clinic

Central location in Orchard, easily accessible by public transport.

1 Orchard Blvd, #05-09 Camden Medical Centre, Singapore 248649

Nearest MRT: Orchard Boulevard Station (TE13)

Tanjong Pagar Clinic

Serving professionals in the CBD with fast, confidential women’s health services.

72 Anson Rd, #01-02 Anson House, Singapore 079911

Nearest MRT: Tanjong Pagar Station (EW15)

Why Choose Our Sexual Health Services?

Discreet, reliable, and professional — here's what makes our care stand out.

Same-Day STD Testing Available

We offer same-day appointments for STD screening, with female doctors available.

Discreet & MOH-Registered

As a licensed medical clinic, we provide confidential care in a safe and respectful environment.

Experienced & Non-Judgemental Team

Our doctors and nurses provide professional support in a respectful, judgement-free setting.