Sensitivity and Specificity

Sensitivity = SnNout (high sens = neg Rule out)

proportion of patients with the disease who have a positive test:

Sensitivity = True positive / [True positive + False negative]

Specificity = SpPin (high spec = pos Rule in)

proportion of patients without the disease who have a negative test:

Specificity = True Negative / [False positive + True negative]


  • Andersson GB, Deyo RA. History and physical examination in patients with herniated lumbar discs. Spine. 1996;21(suppl 24): 10S-18S.

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