Paper I — 2025 March (Supplementary (SAY)) (2019 Scheme) — Qxi
2 min read
Paper I
2025 March (Supplementary (SAY)) (2019 Scheme) · 100 marks · 180 min
Question
(A): Nucleic Acid Testing (NAT) is a better screening method in blood banking
(R): Low antibody levels are detected by NAT
a) Both A & R are correct and R is the reason for A b) Both A & R are correct but R is not reason for A
c) A is correct R is incorrect d) A is incorrect R is correct
a) Both A & R are correct and R is the reason for A
b) Both A & R are correct but R is not reason for A
c) A is correct R is incorrect
d) A is incorrect R is correct
Qxi1 marksMCQs (A/R)
Answer
Correct answer: c) A is correct R is incorrect
A is correct, R is incorrect. Nucleic Acid Testing (NAT) is indeed a superior screening method in blood banking because it directly detects viral genetic material (RNA/DNA), significantly shortening the “window period” compared to antibody-based tests. However, R is incorrect as stated — NAT does not detect antibodies at all (low or otherwise); its entire advantage is that it bypasses the need for antibody formation, detecting the pathogen directly before the host has mounted a detectable antibody response.
