A member asked:

Is a negative rapid hiv antibody test done after 90 days of last exposure conclusive?if i had possible hep c coinfection should i retest at 6 months?can i test hep c now(120 days of last exposure) to get a conclusive result?

A doctor has provided 1 answer
Dr. Hiep Le answered

Specializes in Nephrology and Dialysis

False negative result may occur with rapid HIV antibody test. The most accurate test will be fourth generation HIV test. Yes, for ruling out Hep C infection you should be retested at 6 months post exposure. By UPTODATE: ELISA tests for detecting anti-HCV antibodies become positive as early as eight weeks after exposure, with most patients seroconverting between two and six months after exposure.

Answered 9/11/2021

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