Exercise: Test for urinary tract infection, answer 2

Question 2: The specificity of urine Gram stain was 93.0%. What does this mean and what can we conclude?

Suggested answer:

The specificity of a test is the proportion of those people without the disease, i.e. with no urinary tract infection, who are negative on the test.

93.0% is quite high, so most people with no UTI would be classified as negative by the urine Gram stain test.

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