Hi dear a Tri-dot test detects both HIV (human immunodeficiency virus) p24 antigen and antibody and is equally effective as compared to HIV fourth generation ELISA (enzyme-linked immunosorbent assay) testing. Usually, these tests are positive within 2 to 6 weeks after getting infected. If you will get tested with NAT (nucleic acid test) or western blot test, then it can detect HIV much earlier. But, it is a costly test.So, if you have any positive suspicious history of HIV, then after six to eight week ELISA fourth generation testing or tri-dot rapid testing can be done. You can easily take an online consultation for further treatment guidance