The most appropriate test for an infant born with an infected mother with HIV?

The most appropriate test for an infant born to an HIV-infected mother is a nucleic acid test (NAT) for HIV. This test can detect the presence of the virus in the infant's blood within the first few weeks of life, as opposed to antibody tests which may not be accurate in infants until several months after birth. Early detection is crucial for initiating appropriate treatment and care for the infant.