A Research Laboratory Is Evaluating a New Dipstick Test for Diagnosing

A research laboratory is evaluating a new dipstick test for diagnosing urinary tract infections (UTIs) .  The new test is compared to urinalysis of a midstream urine specimen (considered the diagnostic gold standard) to establish diagnostic test parameters.  The study enrolls 300 patients, of which 100 have a UTI as determined by urinalysis.  The new dipstick test is determined to be 70% sensitive and 90% specific for the diagnosis of UTIs.  How many false positives are present in the study?

A) 20
B) 30
C) 70
D) 120
E) 180

Correct Answer:

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