title: Retrospective analysis of evidence base for tests used in diagnosis and monitoring of disease in respiratory medicine.
abstract: OBJECTIVE
  To determine how many common clinical tests used in a respiratory medicine outpatient clinic are based on high quality evidence.
  
  
  METHODS
  Retrospective review of case notes. Record of first three tests for each patient. Diagnostic tests, tests used to assess existing condition, explicit trials of therapy were included. Literature search for supporting evidence and grading of best evidence for each test.
  
  
  METHODS
  Inner city university teaching hospital in the United Kingdom.
  
  
  METHODS
  All new outpatients referred to a single respiratory medicine team over a period of three months.
  
  
  METHODS
  Proportion of tests supported by level 1a-1c evidence (scale developed by Centre for Evidence Based Medicine).
  
  
  RESULTS
  Only half the tests that were used to make or exclude a diagnosis and a fifth of the tests used to assess a known condition were supported by level 1a-1c evidence. There was no evidence to support trials of therapy.
  
  
  CONCLUSIONS
  A large proportion of clinical tests in respiratory medicine are not supported by level 1a-1c evidence. None of the therapeutic trials that were used were supported by evidence.
authors: Department of Cardiorespiratory Medicine, Hope Hospital, Manchester M6 8HD.
authors: Z
authors: Z
authors: Borrill
authors: C
authors: C
authors: Houghton
authors: P J
authors: PJ
authors: Sullivan
authors: P
authors: P
authors: Sestini
mesh_terms: D003948:Diagnostic Techniques, Respiratory System / Q000592:standards*; D019317:Evidence-Based Medicine; D006801:Humans; D008171:Lung Diseases / Q000175:diagnosis*; D012189:Retrospective Studies; D014504:Urban Health