Fourth-generation HIV tests can detect both HIV antibodies and p24 antigens, while the older tests can only check for antibodies. This means that the newer tests can identify HIV sooner. Learn more here.
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What is a 4th generation HIV test and how does it work?
Is my 30 days HIV 4th generation test good? My doctor said to take another test at 3 months and 6 months mark. Why is that? - Quora