How long does STI screening take to work for HIV infection?

HIV tests look for viral material, an immune response, or both. Those markers do not all appear at the same time, so a test taken soon after exposure may be unable to detect infection. The clinic will consider the test used, the exposure date and any medicines that could affect the result. A negative result obtained during an early window may need repeating at a later point.

A screening result is not the same as a confirmed diagnosis. If a screening test is reactive, the service arranges additional testing and explains the next steps privately. HIV can be present without symptoms, so feeling well cannot replace an appropriately timed test.

Contact a sexual-health service promptly and give the exact exposure time if you can. Emergency preventive medicine may be considered after some recent exposures and works best when started quickly, so do not wait for routine screening. Until you have advice, avoid sharing injecting equipment and use condoms or other barriers. Do not interpret a home or early negative test without checking its window period.

Seek urgent medical advice after a recent high-risk exposure, especially if there was blood contact, condom failure or shared injecting equipment. Emergency care is appropriate for severe illness, confusion, breathing difficulty or rapidly worsening symptoms. Fever, rash, sore throat or swollen glands after an exposure should be discussed promptly, although these symptoms have many possible causes.

Ask which HIV test you are having, when it can detect infection, whether repeat testing is needed, when results will arrive, and whether emergency preventive treatment is appropriate.