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140421 Social & Preventive Medicine

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?

ASensitivity increases specificity decreases
BSensitivity decreases specificity increases
CSensitivity unchanged specificity increases
DSensitivity increases specificity unchanged
Social & Preventive Medicine
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