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Title/link	Description
Positive and negative predictive value of diagnostic tests	This RLO explains how diagnostic test accuracy is described by the terms sensitivity and specificity. Sensitivity describes the accuracy of the test in detecting disease. Specificity describes the accuracy of the test in detecting health.

Glossary

• Sensitivity: the proportion of people with disease who have a positive test result.
• Specificity: the proportion of people without disease who have a negative test result.
• Reference standard: the presence or absence of disease determined by approved methods.
• False positive: a positive test result in a patient without disease.
• False negative result: a negative test result in a patient with disease.

RLO Transcript (Rich Text Format, 23kb)