HIV Antigen/Antibody Combination

Sunquest Code:HIAGAB  
Epic Code:LAB6327Epic Name:HIV Antigen Antibody Combo
Synonyms:Human Immunodeficiency Virus Antigen/Antibody; HIV AG AB; HIV Screen; HIAGAB
Methodology:Chemiluminescent immunoassay
Turnaround Time:Performed Mon-Fri; results are reported within 3 days.
Special Instructions:It is recommended that HIV testing be discussed with the patient prior to collection of the specimen. Written patient consent for HIV testing is not required.
Associated Links:

HIV Diagnostic Algorithm

Collection Instructions

Optimal Volume:3 mL
Minimum\Peds Volume:2.2 mL
Container:Red or gold (gel)
[Alternate Containers: Green (lithium heparin, no gel), Green (lithium heparin, gel), Purple (EDTA), Red (no gel)]
Causes for Rejection:Grossly hemolyzed, heat inactivated, microbial contamination

Processing and Shipping

Specimen Processing:Within 2 hours of collection, centrifuge and aliquot 0.4 mL, 0.1 mL minimum.
Shipping Instructions:Ship at refrigerated temperature.
Stability:After separation from cells: Up to 7 days refrigerated. Freeze aliquot sample if stored for more than 7 days.
Test Performed at or Referral Lab Specialty Core  (UMMC-East Bank)


Reference Range:
The testing algorithm begins with the Abbott HIV-1/2 AG/AB screening immunoassay that simultaneously detects both antibody to human immunodeficiency virus (HIV) and HIV p24 antigen on the Abbott Architect instrument, performed at the East Bank campus. If the patient specimen is repeatedly reactive with the screening assay, it will be tested using the HIV Geenius (BioRad) HIV-1/2 immunoassay, which can differentiate between HIV-1 and HIV-2 antibodies. If the differentiation assay is also reactive, the presence of HIV-1 or HIV-2 antibodies is established. Specimens non-reactive with the HIV Geenius are reported as indeterminate and further testing with a qualitative or quantitative nucleic acid amplification test (NAT) should be performed to identify or rule out acute HIV-1 infection. If both HIV-1 and HIV-2 are positive, additional testing is required to rule out dual infection. The HIV Geenius CPT code is 86701 and 86702 and the Epic Code is LAB6328. The HIV Geenius will only be ordered by the Laboratory. Additional HIV testing is required to rule out dual infection.  
Use:This test is not recommended for patients younger than 18 months of age. If an HIV infection is suspected in a patient  younger than 18 months of age, it is recommended to perform nucleic acid amplification testing.

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