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

## Sensitivity

## Specificity

## Positive predictive value

## Negative predictive value

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

## Useful Links

## --

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It is the true positive rate

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

sensitivity= TP/ (TP+FN)

It is the the true negative rate

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

specificity=TN/(TN+FP)

the percent of all positive tests that are true positives

PPV=TP/(TP+TN)

the percent of all negative tests that are true negative

NPV=TN/(TN+FN)

Clinical tests sensitivity and specificity

Sensitivity, Specificity and Predictive Values