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Biostatistics & Research · single question

Specificity of a diagnostic test is the probability that:

  1. Someone with the disease tests positive
  2. Someone without the disease tests negative
  3. A positive test indicates disease
  4. Disease is present in the population
Show answer and explanation

Correct answer: B. Someone without the disease tests negative

  • A. That is sensitivity.
  • B. Correct. Specificity = TN/(TN+FP): among truly healthy people, the proportion who test negative (rule-in value, SpPin).
  • C. That is positive predictive value.
  • D. That is prevalence.

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