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Interpret Your HIV 1/2 Antibody/Antigen Results
Enter your HIV Ag/Ab value below and get an instant, free AI interpretation — a plain-English explanation checked against WHO/IFCC reference ranges.
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HIV 1/2 Antibody/Antigen Normal Ranges
Fourth-generation HIV combination test simultaneously detects HIV-1 and HIV-2 antibodies AND HIV-1 p24 antigen.
| Reference Range | Unit | Notes |
|---|---|---|
| Negative / Non-reactive | qualitative | Non-reactive = no HIV detected |
Also reported in: S/CO ratio.
Common Causes of High HIV Ag/Ab
HIV-1 infection (responsible for >99% of HIV globally)HIV-2 infection (mainly West Africa — less virulent, progresses more slowly)Acute HIV syndrome (peak p24 antigen before antibody appears — flu-like illness)
Common Causes of Low HIV Ag/Ab
A non-reactive result in someone with very recent high-risk exposure (within 14 days) may be in the window period — retest at 45 days and 90 daysRarely: elite controllers with very low viral loads may have indeterminate results
Want the full clinical guide to HIV 1/2 Antibody/Antigen?
Reference ranges, causes, symptoms, preparation, and FAQs.