When a diagnostic test is used in series mode then-

A. Sensitivity increases but the specificity decreases

B. Specificity increases bu the sensitivity decreases

C. Both sensitivity and specificity increases

D. Both sensitivity and specificity decreases

Correct Answer: Specificity increases bu the sensitivity decreases

Description: Ref:Parks 23rd edition pg 137 When used in series: Sensitivity decreases Specificity increases PPV increases NPV decreases When used in parallel : Sensitivity increases Specificity decreases PPV decreases NPV increases

Category: Social & Preventive Medicine

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