Paper I — 2024 March (Supplementary) (2019 Scheme) — Q13

Paper I

2024 March (Supplementary) (2019 Scheme) · 100 marks · 180 min

Question

Name TWO tests used for diagnosis of HIV infection in window period.

Q131 marks★✓

Answer

Two tests used for diagnosis of HIV infection in the window period (the interval after infection before standard antibody tests become reliably positive): HIV RNA PCR (viral load/nucleic acid testing) and the p24 antigen assay (as incorporated in 4th-generation combination antigen-antibody ELISA) — both detect markers that appear earlier than antibody, shortening the effective window period.

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