People at high risk of certain STIsTrusted Source should ask for a retest,

People at high risk of certain STIsTrusted Source should ask for a retest, even after a negative result. For example, the Centers for Disease Control and Prevention (CDC) recommend annual HIV testing for people at risk, such as those whose partners have HIV or people who share needles.

STI testing table

The testing window for common STIs is as follows:

 Type of STI      Pathogen type  Testing window            Type of test    When to retest after treatment

HIV     virus  10–33 days for a nucleic acid test.

18–45 days for an antigen/antibody test.

23–90 days for an antibody test Blood or saliva test. Blood nucleic acid test gives earliest results None

Chlamydia bacteria 1–2 weeks Blood or urine sample, or swab of the throat, rectum, cervix, or vagina 3 months

Trichomonas protozoa (parasite) 1 week to 1 month Swab of rectum, penis, or vagina 2 weeks

Syphilis bacteria Within 3 weeks after sores appear. Sores appear usually 1 week after exposure            Blood test            6 and 12 months

Gonorrhea      bacteria            5 days to 2 weeks        Blood or urine test. Swab of the anus, urethra, cervix, or throat Test 2 weeks after treatment, or 2 weeks Call girl Kolkata later after exposure if the first test is negative

Herpes virus 1–4 months Blood test or swab of a sore None

HPV virus 3 weeks to a few months Pap smear in females only — no approved test for males None

Hepatitis virus 3–6 weeks for hepatitis B. 2–6 weeks for hepatitis C Blood test Retest 6 months later

HIV

A nucleic acid test analyzes a blood sample for HIV. It can indicate a positive result 10–33 days after exposure. The antigen/antibody test, also a blood test, looks for HIV antibodies. It also looks for an antigen that the body produces before antibodies appear. It can get results 18–45 days after exposure.

The antibody test uses a blood or saliva sample to look for HIV antibodies. It takes the longest to get a reliable result, at 23–90 days after exposure. A person can be confident they do not have HIV if they get a negative test during the window period and have no subsequent contact with someone who could have the virus.

Chlamydia

A doctor can test for chlamydia by swabbing the vagina, cervix, rectum, or throat, or by taking a urine sample. If symptoms appear, they usually present within 7–21 days of exposure. A test can normally detect chlamydia within 1–2 weeks of exposure..

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