Laboratory Services

HIV-1 and HIV-2 Antibody Confirmation and Differentiation, Plasma (not for screening purposes)

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Updated Test Information:

Test Description
HIV-1 and HIV-2 Antibody Confirmation and Differentiation, Plasma (not for screening purposes)

Acquired Immune Deficiency Syndrome (AIDS); Anti-HIV; Anti-HIV-1/-2; Anti-HIV-1/-2 Differentiation; HIV Antibody Differentiation; HIV Types 1 and 2 Antibodies; HIV-1/-2; HIV-1/-2 Ab; HIV-1/-2 Antibodies; HIV-1/-2 Antibody Differentiation; Human Immunodeficiency Virus (HIV)

Test ID
General Information

Useful for:

  • Confirmation and differentiation of HIV-1 and HIV-2 antibodies in plasma specimens that show reactive results with third-(HIV-1/-2 antibody only) and fourth-generation (HIV antigen and antibody) HIV serologic assays

  • This test is not useful as a screening test for HIV infection in symptomatic or asymptomatic individuals, or as a screening or confirmatory test for blood donor specimens

Testing Algorithm:

  • This test is for confirmation and differentiation of HIV-1/2 antibodies

  • If the following result types are obtained, HIV-1 RNA detection and quantification will be performed at an additional charge:

    • HIV-1 and HIV-2 both negative

    • Indeterminate for HIV-1 and negative for HIV-2

    • Negative for HIV-1 and indeterminate for HIV-2

    • HIV-1 and HIV-2 both indeterminate

  • See HIV Testing Algorithm (Fourth-Generation Screening Assay)

Specimen Type


Specimen Requirements

Lavender top (EDTA)

Minimum Sample Volume

0.8 mL

Additional Processing Details

  • Centrifuge blood collection tube per collection tube manufacturer's instructions (eg, centrifuge and aliquot within 2 hours of collection for BD Vacutainer tubes)

  • Aliquot plasma into plastic vial.

Required Information

Date of collection is required


  • Frozen (preferred): 30 days

  • Refrigerated: 6 days


  • Screening, supplemental, or confirmatory serologic tests for HIV-1 or HIV-2 antibodies cannot distinguish between active neonatal HIV infection and passive transfer of maternal HIV antibodies in infants during the postnatal period (up to 2 years). Diagnosis of HIV infection in newborns and infants up to 2 years should be made by virologic tests, such as detection of HIVQN / HIV-1 RNA Detection and Quantification, Plasma

  • This test is not suitable for follow-up testing of patients with reactive results from any rapid HIV tests, regardless of specimen type tested, with the exception of patients who were reactive by the Determine HIV-1/-2 Ag/Ab Combo rapid point-of-care test on serum or plasma (but not whole blood). Per the latest CDC recommended HIV testing algorithm, the patients with reactive results from any rapid HIV tests should be tested subsequently with laboratorybased HIV antigen and antibody combination immunoassays, such as HIVDX / HIV-1 and HIV-2 Antigen and Antibody Diagnostic Evaluation, Plasma

  • A negative result for both HIV-1 and HIV-2 antibodies does not rule-out acute HIV infection

  • All initially positive supplemental or confirmatory HIV test results should be verified by submitting a second specimen for repeat testing. Such positive HIV test results are required under laws in many states in the United States to be reported to the departments of health of the respective states where the patients reside

  • Participation in the recipients of HIV-1 vaccine (eg, participants in HIV-1 vaccine study trials) may develop vaccinespecific antibodies that may cross-react with this test and yield to the vaccine giving a positive, indeterminate, or unreadable HIV-1 antibody result, while they may or may not be infected with HIV-1

  • Assay performance characteristics have not been established for the following specimen characteristics:

    • Heat-inactivated specimens

    • Presence of particulate matter

    • Cadaveric specimens

      • If specimens are autopsy or cadaver blood sources, the proper FDA-licensed assay is HV1CD / HIV-1 and HIV-2 Antibodies for Cadaveric or Hemolyzed Specimens, Serum


Rapid Immunochromatographic Assay

Estimated TAT

1-3 days

Testing Schedule



14 days

CPT Code(s)

86701: 86702

Reference Range


Performing Lab


LOINC Code(s)

68961-2, 81641-3

Additional Information