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The Ultrasound Journal

Table 2 Methods to calculate sensitivity, specificity, PPV, NPV and accuracy

From: Screening for aneurysms of the abdominal aorta using a simple screening device

 

Abdominal ultrasound

 

Positive

Negative

Aorta Scan

 Positive

TP

FP

PPV = TP/(TP + FP)

 Negative

FN

TN

NPV = TN/(FN + TN)

 

Sensitivity = TP/(TP + FN)

Specificity = TN/(FP + TN)

Accuracy = (TP + TN)/All

  1. FN false negative, FP false positive, NPV negative predictive value, PPV positive predictive value, TN true negative, TP true positive
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