High specificity is particularly useful for which type of tests?

High specificity is particularly useful for which type of tests?

• A. Screening tests — low false negatives
• B. Confirmatory tests — low false positives
• C. Screening tests — high false negatives
• D. Confirmatory tests — high false positives

Answer: (B)

High specificity means the test will rarely identify a healthy person as diseased (few false positives). This makes a positive result in a confirmatory test highly trustworthy, which is exactly what you want after an initial screen: to verify disease status without labeling healthy people as cases or subjecting them to unnecessary follow-up. In screening, the priority is to catch as many true cases as possible, so sensitivity (minimizing false negatives) is more critical than maximizing specificity. Therefore, high specificity is most useful for confirmatory tests.

High specificity means the test will rarely identify a healthy person as diseased (few false positives). This makes a positive result in a confirmatory test highly trustworthy, which is exactly what you want after an initial screen: to verify disease status without labeling healthy people as cases or subjecting them to unnecessary follow-up. In screening, the priority is to catch as many true cases as possible, so sensitivity (minimizing false negatives) is more critical than maximizing specificity. Therefore, high specificity is most useful for confirmatory tests.