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Template:DiagnosticTesting Example

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This is an old revision of this page, as edited by Phoenix7777 (talk | contribs) at 10:08, 23 March 2020 (added calculations). 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)
Condition positive Condition negative
Fecal
occult
blood
screen
test
outcome 		Test
outcome
positive 		True positive
(TP) = 20
(2030 x 1.48% x 67%) 		False positive
(FP) = 180
(2030 x (100 - 1.48%) x (100 - 91%)) 		Positive predictive value (PPV)
= TP / (TP + FP)
= 20 / (20 + 180)
= 10%
Test
outcome
negative 		False negative
(FN) = 10
(2030 x 1.48% x (100 - 67%)) 		True negative
(TN) = 1820
(2030 x (100 -1.48%) x 91%) 		Negative predictive value (NPV)
= TN / (FN + TN)
= 1820 / (10 + 1820)
≈ 99.5%
Sensitivity
= TP / (TP + FN)
= 20 / (20 + 10)
≈ 67%
 Specificity
= TN / (FP + TN)
= 1820 / (180 + 1820)
= 91%
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