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Sensitivity — USMLE Step 3 MCQ

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EasyPreventive Medicine, Epidemiology, BiostatisticsSensitivityUSMLE Step 3

A new rapid strep test is evaluated against throat culture. Among 100 patients with culture-confirmed group A streptococcal pharyngitis, 92 have positive rapid tests. Among 100 without disease, 12 have positive rapid tests. Which of the following is the most likely explanation for this patient's findings?

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Correct answer: B — 92%

Sensitivity is the proportion of patients with disease who test positive: 92/100 = 92%.

Reference: Users' Guides to the Medical Literature: Diagnostic Tests