We recommend taking this test after four weeks from potential exposure. The result will give a good indication of your HIV status. However, a small proportion of people tested at this stage will show false positive or negative results. For example, you may have been infected but have not yet produced an antibody response that could be detected by testing. Our test also tests for p24 antigen to improve the chances of finding an infection sooner after exposure. We recommend repeating this test to confirm the result at 12 weeks post-exposure. By this time, virtually all infected people (99.97%) will have produced antibodies that can be detected.