Can you test negative for HIV after exposure while off PrEP, even though you're now back on it?
Yes, this is possible due to the "window period" - the time between HIV exposure and when a test can detect the virus. If you were exposed to HIV while off PrEP and then tested too soon after that exposure, you could receive a Show Full Answer
Can you test negative for HIV after exposure while off PrEP, even though you're now back on it?
Yes, this is possible due to the "window period" - the time between HIV exposure and when a test can detect the virus. If you were exposed to HIV while off PrEP and then tested too soon after that exposure, you could receive a false negative result even though you're infected.
The window period varies by test type:
* NAT tests: 10 to 33 days after exposure
* Antigen/antibody tests (blood draw): 18 to 45 days after exposure
* Rapid antigen/antibody tests (finger stick): 18 to 90 days after exposure
* Antibody tests (most rapid and self-tests): 23 to 90 days after exposure
If you tested during the window period, you should retest after the window period has passed for the specific test type you used. If you had a potential exposure while off PrEP, talk with your doctor about whether you need post-exposure prophylaxis (PEP), which should be started within 72 hours of exposure.
Being back on PrEP now doesn't change whether an earlier exposure resulted in infection - only proper testing after the window period can confirm your status.
April 18
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