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Biostatistics & Research · single question

Sensitivity of a diagnostic test is best defined as the probability that:

  1. Someone with the disease tests positive
  2. Someone without the disease tests negative
  3. A positive test reflects true disease
  4. A negative test reflects true absence of disease
Show answer and explanation

Correct answer: A. Someone with the disease tests positive

  • A. Correct. Sensitivity = TP / (TP + FN): among truly diseased people, the proportion who test positive (rule-out value, SnNout).
  • B. That defines specificity.
  • C. That describes positive predictive value (PPV).
  • D. That describes negative predictive value (NPV).

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