Question:medium

Whole blood is used as a sample for which test?

Updated On: Jun 24, 2026
  • Bacteria
  • IGRA
  • Genexpert
  • Virus
Show Solution

The Correct Option is B

Solution and Explanation

Step 1: Look for the test whose very principle depends on living blood cells, since that test needs whole blood.

Step 2: IGRA fits exactly. Whole blood is incubated with M. tuberculosis antigens, and prior sensitised T lymphocytes respond by secreting interferon-gamma. Measuring this cytokine reveals latent or active TB infection.

Step 3: GeneXpert is usually a sputum-based molecular test, while bacteria and virus are not single named assays. The whole-blood test is therefore IGRA.

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