A new HPV screening test is studied in 500 patients. Of the 100 who truly have the disease, 90 test positive. Of the 400 without disease, 100 test positive. What is the test's sensitivity?

Correct answer: A. 90%

• A. Correct. Sensitivity = TP/(TP+FN) = 90/100 = 90%.
• B. 75.8% would mix in false positives; it is not the sensitivity calculation.
• C. 25% is the false-positive proportion (100/400), related to specificity, not sensitivity.
• D. 18% (90/500) uses the total sample, not the diseased subgroup.