{"name":"STD Ally STI testing windows and follow-up checkpoints","sourceChecked":"2026-08-26","disclaimer":"General timing reference only. Test choice and follow-up depend on symptoms, exposure, treatment, immune status, and clinician guidance.","windows":[{"id":"chlamydia-naat","infection":"Chlamydia","test":"NAAT at exposed sites","windowType":"repeat","startDay":7,"endDay":14,"displayWindow":"Repeat checkpoint: 1-2 weeks","interpretation":"CDC post-exposure guidance says an initial negative NAAT can be repeated 1-2 weeks after exposure when no presumptive treatment was given.","sourceLabel":"CDC 2025 nPEP recommendations","sourceUrl":"https://www.cdc.gov/mmwr/volumes/74/rr/rr7401a1.htm"},{"id":"gonorrhea-naat","infection":"Gonorrhea","test":"NAAT at exposed sites","windowType":"repeat","startDay":7,"endDay":14,"displayWindow":"Repeat checkpoint: 1-2 weeks","interpretation":"CDC post-exposure guidance says an initial negative NAAT can be repeated 1-2 weeks after exposure when no presumptive treatment was given.","sourceLabel":"CDC 2025 nPEP recommendations","sourceUrl":"https://www.cdc.gov/mmwr/volumes/74/rr/rr7401a1.htm"},{"id":"hiv-lab-antigen-antibody","infection":"HIV","test":"Lab antigen/antibody test (blood from a vein)","windowType":"detection","startDay":18,"endDay":45,"displayWindow":"Usually detects at 18-45 days","interpretation":"CDC says a laboratory antigen/antibody test using blood from a vein can usually detect HIV 18-45 days after exposure.","sourceLabel":"CDC HIV testing","sourceUrl":"https://www.cdc.gov/hiv/testing/index.html"},{"id":"hiv-antibody","infection":"HIV","test":"Antibody test, including most self-tests","windowType":"detection","startDay":23,"endDay":90,"displayWindow":"Usually detects at 23-90 days","interpretation":"CDC says antibody tests, including most rapid and self-tests, can usually detect HIV 23-90 days after exposure.","sourceLabel":"CDC HIV testing","sourceUrl":"https://www.cdc.gov/hiv/testing/index.html"},{"id":"hiv-nat","infection":"HIV","test":"Nucleic acid test (NAT)","windowType":"detection","startDay":10,"endDay":33,"displayWindow":"Usually detects at 10-33 days","interpretation":"CDC says a NAT can usually detect HIV 10-33 days after exposure. Clinicians generally reserve it for specific recent-exposure situations.","sourceLabel":"CDC HIV testing","sourceUrl":"https://www.cdc.gov/hiv/testing/index.html"},{"id":"syphilis-serology","infection":"Syphilis","test":"Serologic blood testing","windowType":"repeat","startDay":28,"endDay":42,"followUpDay":90,"displayWindow":"Repeat at 4-6 weeks and again at 3 months","interpretation":"CDC post-exposure guidance allows repeat syphilis serology at 4-6 weeks and 3 months when an initial result is negative and infection in the source cannot be ruled out.","sourceLabel":"CDC 2025 nPEP recommendations","sourceUrl":"https://www.cdc.gov/mmwr/volumes/74/rr/rr7401a1.htm"},{"id":"hepatitis-b-hbsag","infection":"Hepatitis B","test":"Hepatitis B surface antigen (HBsAg)","windowType":"detection","startDay":7,"endDay":84,"displayWindow":"Can appear about 1-12 weeks after exposure","interpretation":"CDC's Pink Book says HBsAg can be detected as early as 1-2 weeks and as late as 11-12 weeks after exposure.","sourceLabel":"CDC Pink Book: Hepatitis B","sourceUrl":"https://www.cdc.gov/pinkbook/hcp/table-of-contents/chapter-10-hepatitis-b.html"},{"id":"hepatitis-c-rna","infection":"Hepatitis C","test":"HCV RNA test","windowType":"detection","startDay":7,"endDay":14,"displayWindow":"RNA usually becomes detectable at 1-2 weeks","interpretation":"CDC says detectable HCV RNA levels usually appear 1-2 weeks after exposure.","sourceLabel":"CDC hepatitis C diagnosis and testing","sourceUrl":"https://www.cdc.gov/hepatitis-c/hcp/diagnosis-testing/index.html"},{"id":"hepatitis-c-antibody","infection":"Hepatitis C","test":"HCV antibody test","windowType":"detection","startDay":56,"endDay":77,"displayWindow":"Antibodies usually become detectable at 8-11 weeks","interpretation":"CDC says it usually takes 8-11 weeks before HCV antibodies are detectable after an acute exposure.","sourceLabel":"CDC hepatitis C diagnosis and testing","sourceUrl":"https://www.cdc.gov/hepatitis-c/hcp/diagnosis-testing/index.html"}]}