Exercise: Test for urinary tract infection, answer 6

Question 6: Which are the false positive and false negatives and how many are there of each?

Urine Gram stain	UTI		Total
	Positive	Negative
Positive	50	3	53
Negative	2	40	42
Total	52	43	95

Suggested answer:

False positives are those whom the test finds to be positive but do not have the disease. Hence there are 3 of them.

False negatives are those whom the test finds to be negative but do, in fact, have the disease. Hence there are 2 of them.

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