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June 11, 1994BMJ2,083 citationsOpen Access

Statistics Notes: Diagnostic tests 1: sensitivity and specificity

DADouglas G. AltmanJBJ Martin Bland

Key Points

  • The aim is to explain the concepts of sensitivity and specificity in diagnostic tests.
  • Used examples of diagnostic tests such as x-ray examinations and biopsies.
  • Described classification of patients based on test results and the presence or absence of symptoms.
  • Illustrated the relationship between test results and correct diagnoses using a liver scan and necropsy.

Abstract

The simplest diagnostic test is one where the results of an investigation, such as an x ray examination or biopsy, are used to classify patients into two groups according to the presence or absence of a symptom or sign. For example, the table shows the relation between the results of a test, a liver scan, and the correct diagnosis based on either necropsy, …

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Cite This Study

Altman et al. (1994) studied this question.

synapsesocial.com/papers/69d925dc8988aeabbe68452chttps://doi.org/10.1136/bmj.308.6943.1552
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