False-negative test results in a laboratory test for HIV antibody may occur because of

False-negative test results in a laboratory test for HIV antibody may occur because of

• A. Collection of the test sample before seroconversion.
• B. Heat inactivation of the serum before testing.
• C. Interference by autoantibodies.
• D. Recent exposure to certain vaccines.

Answer: (A)

False-negative HIV antibody results occur mainly when testing is done before the body has produced detectable HIV-specific antibodies. After infection, there is a window period during which antibody levels are too low to be detected by standard antibody tests. If a sample is collected during this time, the test can appear negative even though infection is present. As seroconversion progresses and antibody levels rise, subsequent testing is more likely to become positive. To catch early infection, clinicians may use tests that detect the virus directly (such as HIV RNA) or repeat antibody testing after a few weeks to allow seroconversion.

False-negative HIV antibody results occur mainly when testing is done before the body has produced detectable HIV-specific antibodies. After infection, there is a window period during which antibody levels are too low to be detected by standard antibody tests. If a sample is collected during this time, the test can appear negative even though infection is present. As seroconversion progresses and antibody levels rise, subsequent testing is more likely to become positive. To catch early infection, clinicians may use tests that detect the virus directly (such as HIV RNA) or repeat antibody testing after a few weeks to allow seroconversion.