A study is planned to check stool occult blood positivity using hemoccult test among a group of paicipants aged 50 – 75 years. The test is repeated if result is positive. No repeating if the test is negative. What is the effect on sensitivity and specificity?
Correct Answer: Sensitivity decreases specificity increases
Description: SCREENING TESTS IN One test (after +ve result) after other Both tests applied together COMBINED SERIES PARALLEL SENSITIVITY Decreases Increases SPECIFICITY Increases Decreases PPV Increases Decreases NPV Decreases Increases
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Social & Preventive Medicine
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