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Template:DiagnosticTesting Example

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This is an old revision of this page, as edited by Skbkekas (talk | contribs) at 22:06, 1 March 2011 (Created template from second part of Template:SensSpecPPVNPV). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
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Patients with bowel cancer
(as confirmed on endoscopy)
Positive Negative
Fecal
occult
blood
screen
test
outcome 		Positive TP = 2 FP = 18 → Positive predictive value
= TP / (TP + FP)
= 2 / (2 + 18)
= 2 / 20
= 10%
Negative FN = 1 TN = 182 → Negative predictive value
= TN / (FN + TN)
= 182 / (1 + 182)
= 182 / 183
≈ 99.5%
↓
Sensitivity
= TP / (TP + FN)
= 2 / (2 + 1)
= 2 / 3
≈ 66.67% 		↓
Specificity
= TN / (FP + TN)
= 182 / (18 + 182)
= 182 / 200
= 91%
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