A review identifies and classifies reasons for ordering diagnostic tests

J Clin Epidemiol. 2007 Oct;60(10):981-9. doi: 10.1016/j.jclinepi.2007.01.012. Epub 2007 Jul 16.


Objective: To consider the reasons and context for test ordering by doctors when faced with an undiagnosed complaint in primary or secondary care.

Study design and setting: We reviewed any study of any design that discussed factors that may affect a doctor's decision to order a test. Articles were located through searches of electronic databases, authors' files on diagnostic methodology, and reference lists of relevant studies. We extracted data on: study design, type of analysis, setting, topic area, and any factors reported to influence test ordering.

Results: We included 37 studies. We carried out a thematic analysis to synthesize data. Five key groupings arose from this process: diagnostic factors, therapeutic and prognostic factors, patient-related factors, doctor-related factors, and policy and organization-related factors. To illustrate how the various factors identified may influence test ordering we considered the symptom low back pain and the diagnosis multiple sclerosis as examples.

Conclusions: A wide variety of factors influence a doctor's decision to order a test. These are integral to understanding diagnosis in clinical practice. Traditional diagnostic accuracy studies should be supplemented with research into the broader context in which doctors perform their work.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Attitude of Health Personnel*
  • Decision Making*
  • Delivery of Health Care / methods*
  • Diagnostic Services*
  • Humans
  • Low Back Pain / etiology
  • Multiple Sclerosis / diagnosis
  • Practice Patterns, Physicians'
  • Prognosis