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Determining Diagnostic Test Quality
by Mahmoud H. Al-Johani
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Determining Diagnostic Test Quality

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Sensitivity

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It is the true positive rate

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Sensitivity of a test is the percentage of all patients with disease present who have a positive test

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sensitivity= TP/ (TP+FN)

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Specificity

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It is the the true negative rate

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Specificity of a test is the percentage of all patients without disease who have a negative test.

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specificity=TN/(TN+FP)

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Positive predictive value

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the percent of all positive tests that are true positives

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PPV=TP/(TP+TN)

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Negative predictive value

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the percent of all negative tests that are true negative

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NPV=TN/(TN+FN)

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The diagnostic value of a procedure is defined by its sensitivity, specificity, predictive value and efficiency.

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Useful Links

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Clinical tests sensitivity and specificity

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Sensitivity, Specificity and Predictive Values

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