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Template:DiagnosticTesting Example

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This is an old revision of this page, as edited by Cmglee (talk | contribs) at 00:45, 2 April 2011 (Merge from Template:SensSpecPPVNPV). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
Patients with bowel cancer
(as confirmed on endoscopy)
Positive Negative
Fecal
occult
blood
screen
test
outcome 		Positive True Positive
(TP) = 20 		False Positive
(FP) = 180 		→ Positive predictive value
= TP / (TP + FP)
= 20 / (20 + 180)
= 20 / 200
= 10%
 Negative  False Negative
(FN) = 10 		True Negative
(TN) = 1820 		→ Negative predictive value
= TN / (FN + TN)
= 1820 / (10 + 1820)
= 1820 / 1830
≈ 99.5%
↓
Sensitivity
= TP / (TP + FN)
= 20 / (20 + 10)
= 20 / 30
≈ 66.67% 		↓
Specificity
= TN / (FP + TN)
= 1820 / (180 + 1820)
= 1820 / 2000
= 91%
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