The Body: The Complete HIV/AIDS Resource
Follow Us Follow Us on Facebook Follow Us on Twitter Download Our App 
Professionals >> Visit The Body PROThe Body en Espanol
Ask the Experts About

Choosing Your MedsChoosing Your Meds
Rollover images to visit our other forums!
  • Email Email
  • Glossary Glossary

HIV-1 DNA by PCR test and HIV-1 Abs test
Jun 30, 2009

Hi, I took the tests above on the 36th day after exposure. Both tests came negative, (I'm not in any med, never tested positive)However, I'm wondering how accurate these results are? Should I repeat the tests, when? What was the posibility of getting an false negative? For how long should I continue repeating these tests? Do you suggest any other test? Thank you

Response from Dr. McGowan

Shortly after an exposure the HIV ab test may not have time to turn positive. Usually the earliest would be by 2 weeks and most will be positive by 6 weeks. We repeat the testing for 3 months to be sure to catch all positives.

The HIV PCR test should be positive by day 36, usually at a high titer. We generally would not run this test unless a person had symtoms of seroconversion (fever, swollen glands, rash, sores in the mouth, etc). In that circumstance it should be postive and would be highly unlikely to be "false negative" The one caveat would be if you took post-exposure prophylaxis for 4 weeks which might delay the virus growth in the blood and make the PCR low/negative.



CD4 rose from 110 to 624 within 2 months
Back on Meds

  • Email Email
  • Glossary Glossary



This forum is designed for educational purposes only, and experts are not rendering medical, mental health, legal or other professional advice or services. If you have or suspect you may have a medical, mental health, legal or other problem that requires advice, consult your own caregiver, attorney or other qualified professional.

Experts appearing on this page are independent and are solely responsible for editing and fact-checking their material. Neither nor any advertiser is the publisher or speaker of posted visitors' questions or the experts' material.

Review our complete terms of use and copyright notice.

Powered by ExpertViewpoint