HIV test after 30–45 days — reliable or not?

Modern HIV testing is highly accurate, and the window period is shorter than many people believe. Fourth-generation tests detect both HIV antibodies and p24 antigen. A negative fourth-generation test at 45 days after exposure is considered conclusive by most guidelines — you do not need to wait 90 days if this is the test you had. The 90-day figure that circulates widely relates to older antibody-only tests. Rapid point-of-care tests vary. Some are antibody-only with longer windows, so ask which test was used and when it becomes conclusive for that specific assay. If the exposure was very recent — within 72 hours — post-exposure prophylaxis may be available and is time-critical. Seek care immediately rather than waiting to test. Anxiety while waiting is common and genuinely difficult. Sexual health clinics are used to this and can advise on timing without judgement. Confirm the window period with whoever performed your test, since it depends on the assay used. And if you have ongoing risk, regular testing is more useful than a single result.