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USMLE · Question #477
USMLE Question #477: Real Exam Question with Answer & Explanation
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Question
A new blood test to detect prostate cancer is evaluated in 300 male volunteers. A needle biopsy of the prostate gland is done on all men with serum prostate- specific antigen concentrations greater than 5ng/mL (N < 4). One hundred men undergo biopsy procedures; 90 are found to have prostate cancer, and five are found to have chronic prostatitis. Which of the following is necessary to calculate the sensitivity of this test?
Options
- AIncidence of chronic prostatitis in the general population
- BNumber of men with test results greater than 5 ng/mL and a normal biopsy speciemen
- CPrevalence of chronic prostatitis in the general population
- DProstate biopsies of men with test results equal to or below 5 ng/mL
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