I did an HIV test 45 days of the risk situation but did not say if it was 4 generation or what generation it was the following:
Anti HIV 1 + 2 AND ANTIGEN P24 NEGATIVE
This test is based on the simultaneous determination of IgG anti-HIV1 and anti-HIV2 and antigenaemia p24, which allows to reduce the delay between contamination and virus detection.
Is it a fourth generation test? The Spanish health ministry told me that a 4-generation test passed 6 weeks of the risk situation.
Thank you for your inquiry. From what we gather from the question, you were asking about the type of HIV test you received and if it is classified as a 4th generation test.
HIV tests that only include testing for the presence of antibodies (Ab) to HIV-1/2 are classified as 3rd generation tests. These tests detect 95% of HIV infections 40 days after exposure and 99% of HIV infections 3 months after exposure (1). HIV tests that include testing for both the presence of HIV-1/2 antibodies as well as the p24 antigen are classified as 4th generation tests. These tests are able to detect 99% of infections 6 weeks after exposure and 99.8% of infections 12 weeks after exposure.
You received a 4th generation test. Most HIV specialists consider this type of test conclusive 6 week post-exposure as it is able to accurately detect HIV infection in 99% of people (1). Some physicians and guideline recommend re-testing 12 weeks post-exposure.
Recommendation: Refer to a physician for more personalized answers.
AIDS Vancouver Helpline/Online, Marie