Dear Si. it needs at least 3- 6 month time after the exposure which is called the window period for HIV
anti bodies to be detected.
HIV virus are often detected by a screening test called an ELISA
. The ELISA test is repeated if positive. The ELISA method is very sensitive but requires another test, a Western Blot, to confirm the results because false positives can occur. These tests can be done on blood, urine or oral sample in a doctor’s office or a local clinic.
Bajuaid Ali .MD