Infectious DiseaseInfectious Disease

H.I.V. ELISA

Normal Range
Non-reactive (< 1.00 Index)
Sample Type
Serum
Fasting
No
Unit
Index

Function

The HIV ELISA (Enzyme-Linked Immunosorbent Assay) is a screening test designed to detect antibodies produced by the body in response to infection with HIV-1 and HIV-2. Modern versions (4th generation) also detect the p24 antigen, a protein that is part of the virus itself, allowing for earlier detection than older antibody-only tests.

Why it is Ordered

This is the standard first-line screening test for HIV. It is recommended as part of routine healthcare for adults, for prenatal screening in pregnant women, and following potential occupational or sexual exposure to the virus. Because of its high sensitivity, it is excellent at 'ruling out' the virus.

Associated Conditions

  • HIV-1/HIV-2 Infection: The primary condition detected.
  • Acute Retroviral Syndrome: The initial symptomatic stage of infection.
  • Asymptomatic HIV: The long period where the virus is active but symptoms are absent.

Diagnostic Algorithm

A 'Reactive' ELISA is not a final diagnosis. Per CDC guidelines, a reactive screening result must be followed by a confirmatory 'differentiation' assay (to distinguish between HIV-1 and HIV-2) and/or a Nucleic Acid Test (PCR) to confirm the presence of the virus.

Check Your Result

Check Your Result

Interactive
Index

Enter your lab result to see where you stand compared to the standard reference range.

Why Context Matters

The ELISA test has a 'window period'—the time between exposure and when the test can reliably detect infection (usually 3-6 weeks). If tested too early, a 'false negative' may occur. Conversely, 'false positives' can be triggered by recent flu vaccinations, certain autoimmune diseases (like Lupus), or even multiple pregnancies, where cross-reactive antibodies may trigger the assay. Any reactive result must be confirmed with a more specific secondary test.

Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.

Clinical References

Source-of-truth databases and clinical guidelines for H.I.V. ELISA:

Research & Guidelines

Related Indicators

VDRL Test

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Anti-HEV Antibodies

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Anti-HBc IgM

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DR

Medically Reviewed by Dr. Binoy Babu, MBBS

Board Certified Doctor • 10+ Years Clinical Experience

Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.

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