In HIV testing for a neonate, which test is most accurate?

In HIV testing for a neonate, which test is most accurate?

• A. RNA PCR
• B. ELISA
• C. DNA polymerase chain reaction (PCR)
• D. Western blot

Answer: (C)

Neonatal HIV diagnosis relies on direct detection of the virus rather than maternal antibodies. Because maternal HIV antibodies cross the placenta, antibody-based tests like ELISA or Western blot can be positive even in babies who are not infected, making them unreliable for early diagnosis. Nucleic acid tests look for the virus’s genetic material, providing direct evidence of infection. Among these, DNA PCR detects HIV proviral DNA in the infant’s cells and has the strongest validation for early infant diagnosis, making it the most accurate choice for a neonate. While RNA PCR can also identify the virus, DNA PCR is the preferred, widely validated method for confirming infection in newborns.

Neonatal HIV diagnosis relies on direct detection of the virus rather than maternal antibodies. Because maternal HIV antibodies cross the placenta, antibody-based tests like ELISA or Western blot can be positive even in babies who are not infected, making them unreliable for early diagnosis. Nucleic acid tests look for the virus’s genetic material, providing direct evidence of infection. Among these, DNA PCR detects HIV proviral DNA in the infant’s cells and has the strongest validation for early infant diagnosis, making it the most accurate choice for a neonate. While RNA PCR can also identify the virus, DNA PCR is the preferred, widely validated method for confirming infection in newborns.