{"id":"hiv-ag-ab","name":"HIV-1/2 Antigen/Antibody (4th Generation)","shortName":"HIV Ag/Ab","aliases":["HIV Screen","HIV 1/2 Antigen/Antibody","HIV Ag/Ab","HIV Ag/Ab Combo","HIV-1/2 Ag/Ab, 4th Generation","HIV 4th Generation","HIV 1/2 Ag/Ab","HIV-1/HIV-2 Antibodies and p24 Antigen","HIV 1/2 antibody and p24 antigen","HIV combo","HIV-1/-2 Ag and Ab Screen","HIV-1 and HIV-2 Antigen and Antibody Routine Screen","HIV Antigen and Antibody Screen","HIV Ag/Ab Screen","HIV-1/2 Ag/Ab Screen","HIV Combo Test","Fourth Generation HIV Test"],"abbreviations":["HIV Ag/Ab","HIV Combo","HIV-1/2 Ag/Ab"],"loinc":[{"code":"56888-1","primary":true},{"code":"58900-2","primary":false},{"code":"105080-6","primary":false},{"code":"108720-4","primary":false}],"specimen":"serum-or-plasma","units":[],"referenceRanges":[],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"A blood test that looks for HIV antibodies and a viral protein (p24), so it can find an infection earlier than tests that only look for antibodies.","url":"https://bloodtesttracker.com/markers/hiv-ag-ab","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}