What is the accuracy of the HIV Duo test?

Question

Hello doctor,

I engaged in protected vaginal sex and unprotected oral sex with an unknown individual. I sought consultation from a dermatologist who specializes in sexually transmitted diseases (STDs). The dermatologist conducted an HIV (Human Immunodeficiency Virus) duo test, which detects both HIV antibodies and the p24 antigen simultaneously.

I took the test at 15 days, 30 days, and 72 days (10.5 weeks) after the encounter, and all results came back negative. My consulting doctor assured me that these results are conclusive and that I should not worry further. However, I still feel anxious about the situation. I would appreciate your confirmation regarding the accuracy of my doctor's assessment and whether I should move on from this concern.

Thank you.

Answer 1

Hello,

Welcome to icliniq.com.

I read your query, and I can understand your concern. The following information will help you. The newer generation combo tests have high sensitivity, meaning they are capable of detecting the presence of HIV (human immunodeficiency virus) infection reliably. However, it is important to note that HIV has a window period, which is the time between infection and when modern tests can consistently detect antibodies or antigens.

This window period typically ranges from three weeks to a maximum of six months. The risk of contracting HIV through oral sex is generally very low. It would require open mucosal or skin wounds in the mouth, and even then, the risk remains low, though not zero. To effectively rule out HIV infection, taking into account the window period, it is recommended to undergo testing at least six months after the last risky sexual contact.

If your most recent test was conducted six months or more after the sexual contact, it provides a reliable indication that HIV infection is excluded. However, if this time frame has not passed, even with two negative combo test results and considering the low risk associated with your type of contact, an additional test can be performed at least six months after the sexual contact to further ensure exclusion of HIV infection.

Kind regards.

Thank you.