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Template:DiagnosticTesting Example

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This is an old revision of this page, as edited by Ghthaker1955 (talk | contribs) at 18:50, 22 May 2020. 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 Prevalence
= (TP+FN)/Total_Population
= (20+10)/2030
≈1.48%
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%
False negative rate (FNR), Miss rate
= FN/(TP+FN)
= 10/(20+10)
≈ 33.3%
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