HIV DNA Test: Detection, PCR Method, and Clinical Utility
Synonyms
HIV DNA PCR Test, HIV DNA Amplification Assay, Proviral DNA Detection, HIV DNA Hybridization
Test Commonly Includes
Amplification and detection of HIV proviral DNA from peripheral blood lymphocytes using PCR and DNA hybridization.
Abstract
HIV DNA testing detects the genetic material of HIV integrated into host cells. It is especially useful in newborns from HIV-positive mothers and in cases with unclear serology. Traditional antibody-based testing may fail during the window period or due to maternal antibody transfer. PCR allows direct detection of proviral DNA in infected lymphocytes, offering early diagnosis.
Specimen
- Whole blood in ACD, EDTA, or sodium heparin tubes
Container
- Yellow-top (ACD) or lavender-top (EDTA) Vacutainer® tubes
Collection
Collect two tubes of blood as per lab preference. Send at room temperature within 48 hours.
Storage Instructions
Keep at room temperature and transport within 48 hours of collection. Do not freeze.
Reason to Reject Sample
- Samples with low volume
- Samples older than 48 hours
Turnaround Time
Approximately 2 weeks (may vary by laboratory)
Use
– Diagnosing HIV in infants born to HIV-positive mothers
– Clarifying equivocal or indeterminate HIV serology
– Early detection after high-risk exposure
Limitations
- Low sensitivity in early infection due to low viral load in lymphocytes
- Serologic testing remains essential for initial screening
Methodology
Peripheral blood lymphocyte DNA is extracted and amplified using the polymerase chain reaction (PCR) targeting specific HIV genome regions. Amplified products are hybridized with HIV-specific DNA probes. Detection is performed using autoradiography or enzymatic labeling.
Additional Information
This assay is vital in newborns with maternally transferred antibodies, where traditional serology may be unreliable. HIV culture is slow and less sensitive. PCR offers rapid and accurate proviral DNA detection, becoming the preferred confirmatory test in modern HIV diagnostics.
References
- Jacobs, Demott, Finley, Horvat, Kasten.JR, & Tilzer, “Laboratory Test Handbook”, Lexi-Comp Inc, 1994
- Loche M & Mach B. Lancet, 1988
- Phair JP & Wolinsky S. Clin Infect Dis, 1992
- Wilber JC. Lab Diagnosis of Viral Infections, 1992
- Rogers MF et al. N Engl J Med, 1989
- Saiki RK et al. Science, 1988
- Harper ME et al. Proc Natl Acad Sci USA, 1986
