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Original Article
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Volume 298:486-489 March 2, 1978 Number 9
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The diagnostic importance of the normal finding
GA Gorry, SG Pauker, and WB Schwartz

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Abstract

When a diagnostic test is reported as normal, the clinician generally uses it only to rule out certain diseases. However, if properly interpreted, the normal value may help to differentiate among diagnoses that yield normal results with different frequencies. A simple method permits the extraction of such information. The physician estimates the probability of various diagnoses and then combines these estimates with the anticipated frequency of negative results for each disease under consideration.

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