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Negative predictive value

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This is the post-test probability of a negative test. This test addresses the question - if a person has a negative test, what is the probability that he or she does not have the condition:



true negative / (false negative + true negative) x 100%

NPV is affected by the prevalence of the disease

in low prevalence settings, even a test with moderate sensitivity and specificity can have a high NPV

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	Target Disorder Present	Target Disorder Absent
Test result positive	True Positive (TP)	False Positive (FP)
Test result negative	False Negative (FN)	True Negative (TN)

Negative predictive value

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