How soon you get STI symptoms after exposure varies a lot per STI. Chlamydia and gonorrhoea usually give complaints within 1 to 3 weeks, if they give any at all. Herpes blisters typically appear within a few days to a couple of weeks, and a syphilis sore on average around 3 weeks. With HIV the early, flu-like complaints usually belong to the first weeks.
There is a catch: complaints and reliable testing do not run in step. A test only becomes truly reliable after the window period.
What is the difference between incubation and window period?
The incubation period is the time until you might get complaints. The window period is the time until a test can reliably detect the STI. The two are not the same: you can already have complaints while a test is still too early, or have no complaints while the test is already reliable.
| STI | Complaints usually after | Reliable testing from |
|---|---|---|
| Chlamydia | 1 to 3 weeks (often none) | About 2 weeks |
| Gonorrhoea | 2 to 7 days (men more often) | About 1 to 2 weeks |
| Genital herpes | 2 days to several weeks | With complaints (swab a blister) |
| Syphilis | Around 3 weeks (10 to 90 days) | About 6 weeks |
| HIV | 2 to 4 weeks (flu-like) | About 6 weeks |
How soon after risk can you test for HIV?
The early, flu-like complaints with HIV usually come 2 to 4 weeks after exposure. A test, however, only becomes reliable after the window period. Research estimates the average window period at about 45 days, with antibodies detectable within 141 days in at least 90 percent of people (Petersen et al., Transfusion 1994, PMID 8178324). Modern tests are often reliable sooner.
More on early HIV complaints and test reliability is in HIV early symptoms.
How soon do herpes and syphilis appear?
With genital herpes the first outbreak can take longer than many people think. In a clinical study the incubation period ran up to 49 days in men and 28 days in women (Thin, Int J STD AIDS 1991, PMID 1911962). Syphilis starts on average around 3 weeks with a painless sore, after which the stages unfold over weeks to months (Peeling et al., Lancet 2023, PMID 37481272).
Unsure whether you are in time? Absence of complaints does not mean you are safe. See also STI without symptoms.
Why do complaints and test reliability not run in step?
Your body and the test look at different things. Complaints arise when your immune system reacts to the infection, while a test waits until there is enough material or antibodies to detect it reliably. Those two moments rarely coincide.
With HIV you see this well: the first, flu-like complaints often come after 2 to 4 weeks, but the antibody test only becomes truly reliable on average around 6 weeks (Petersen et al., Transfusion 1994, PMID 8178324).
That is why testing too early can falsely reassure. A negative result within the window does not yet rule out an STI.
Can you test too early?
Yes, and it is one of the most common mistakes. If you test a day after a risk moment, the test will likely see nothing, even if you are infected. A negative result then gives false certainty.
It is better to wait out the reliable window period, or to retest after the window if in doubt. If you have clear complaints, talk to your GP or the GGD right away, regardless of the window.
More on the right moment after sex is in how long after unprotected sex you can test.
When is the best time to test?
Do not test right after a risk moment, but wait until you are within the reliable window period. For chlamydia and gonorrhoea that is usually after about 2 weeks, for HIV and syphilis often around 6 weeks. The Dutch RIVM and the NHG-Standaard Het soa-consult use similar guidance; Thuisarts.nl offers calm explanation.
For the most common STIs, the check for chlamydia, gonorrhoea and trichomonas is a logical choice once you are within the window. Want to know exactly how long to wait after sex first, read how long after unprotected sex you can test.
Sources
- Petersen LR, et al. Duration of time from onset of HIV-1 infectiousness to development of detectable antibody. Transfusion. 1994. PMID 8178324
- Thin RN. Does first episode genital herpes have an incubation period? A clinical study. Int J STD AIDS. 1991. PMID 1911962
- Peeling RW, Mabey D, Chen XS, Garcia PJ. Syphilis. Lancet. 2023. PMID 37481272
- Korenromp EL, et al. What proportion of episodes of gonorrhoea and chlamydia becomes symptomatic? Int J STD AIDS. 2002. PMID 11839163
- RIVM, Sexual health and STIs. NHG-Standaard Het soa-consult. Thuisarts.nl.
This information is general and does not replace personal medical advice. Every STI test result at Discreet Test is reviewed by a BIG-registered doctor. Always discuss symptoms or treatment decisions with your GP, the GGD or a sexual health clinic.
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