No HIV test can detect HIV immediately after infection. The time between exposure and when a test can detect HIV is called the window period, and it differs by test type. Antibody tests can usually detect HIV 23 to 90 days after exposure, rapid antigen/antibody tests using finger-stick blood 18 to 90 days after exposure, and laboratory antigen/antibody tests using blood from a vein 18 to 45 days after exposure.
If you test after a recent possible exposure and receive a non-reactive result, repeat testing after the applicable window period may be necessary. If the possible exposure occurred within the last 72 hours, seek medical advice urgently because PEP may be appropriate.
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