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Home Q & A Board Biology-Related Homework Help Medicine Nursing and Clinical
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lizardasuje lizardasuje
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6 years ago
How is the specificity of a screening test calculated?
 
  A) True positives/Total diseased
  B) True negatives/Total not diseased
  C) False negatives/Total diseased or 1  Sensitivity
  D) False positives/Total not diseased or 1  Specificity
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#1
6 years ago
Ans: B
Specificity (true-negative rate) is calculated as True negatives/Total not diseased. Sensitivity (true-positive rate) is calculated as True positives/Total diseased. False-negative rate is calculated as False negatives/Total diseased or 1  Sensitivity. False-positive rate is calculated as False positives/Total not diseased or 1  Specificity.
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