HIV Ag/Ab Combo
The HIV Ag/Ab Combo test detects both HIV antibodies and the p24 antigen in the blood. It is the recommended initial screening test for HIV infection.
Category: Infectious Disease
Also known as: hiv ag/ab, hiv antigen antibody, hiv combo, hiv 1/2 ag/ab, hiv test, hiv screen, hiv p24 antigen antibody, hiv ag/at kombinovani
Reference range: 0–1 S/CO (Source: ABIM)
Standard unit: S/CO
High values may indicate
A positive (reactive) result indicates possible HIV infection. Confirmatory testing is required to confirm the diagnosis.
Low values may indicate
A negative (non-reactive) result means no HIV antibodies or antigens were detected, indicating no current HIV infection (assuming adequate time since potential exposure).
Frequently asked questions
- What is a normal HIV Ag/Ab Combo level?
- A typical reference range for HIV Ag/Ab Combo is 0–1 S/CO (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is HIV Ag/Ab Combo measured in?
- HIV Ag/Ab Combo is most commonly reported in S/CO. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do HIV Ag/Ab Combo reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track HIV Ag/Ab Combo over time?
- Yes. Upload results from any lab and BloodId charts your HIV Ag/Ab Combo over time against its reference range, so you can see whether the trend is rising, falling, or stable.
Related biomarkers
Source: MedlinePlus, U.S. National Library of Medicine
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