title: Clinical predictors of a diagnosis of idiopathic pulmonary fibrosis.
abstract: BACKGROUND
  Idiopathic pulmonary fibrosis (IPF) and other idiopathic interstitial pneumonias (IIPs) have similar clinical and radiographic features, but their histopathology, response to therapy, and natural history differ. A surgical lung biopsy is often required to distinguish between these entities.
  
  
  OBJECTIVE
  We sought to determine if clinical variables could predict a histopathologic diagnosis of IPF in patients without honeycomb change on high-resolution computed tomography (HRCT).
  
  
  METHODS
  Data from 97 patients with biopsy-proven IPF and 38 patients with other IIPs were examined. Logistic regression models were built to identify the clinical variables that predict histopathologic diagnosis of IPF.
  
  
  RESULTS
  Increasing age and average total HRCT interstitial score on HRCT scan of the chest may predict a biopsy confirmation of IPF. Sex, pulmonary function, presence of desaturation, or distance walked during a 6-minute walk test did not help discriminate pulmonary fibrosis from other IIPs.
  
  
  CONCLUSIONS
  Clinical data may be used to predict a diagnosis of IPF over other IIPs. Validation of these data with a prospective study is needed.
authors.affiliation: Division of Respiratory Medicine, University of Calgary, Calgary, AB, T1Y 6J4 Canada. cfell@ucalgary.ca
authors.forename: Charlene D
authors.initials: CD
authors.lastname: Fell
authors.forename: Fernando J
authors.initials: FJ
authors.lastname: Martinez
authors.forename: Lyrica X
authors.initials: LX
authors.lastname: Liu
authors.forename: Susan
authors.initials: S
authors.lastname: Murray
authors.forename: Meilan K
authors.initials: MK
authors.lastname: Han
authors.forename: Ella A
authors.initials: EA
authors.lastname: Kazerooni
authors.forename: Barry H
authors.initials: BH
authors.lastname: Gross
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Myers
authors.forename: William D
authors.initials: WD
authors.lastname: Travis
authors.forename: Thomas V
authors.initials: TV
authors.lastname: Colby
authors.forename: Galen B
authors.initials: GB
authors.lastname: Toews
authors.forename: Kevin R
authors.initials: KR
authors.lastname: Flaherty
mesh_terms: D000367:Age Factors; D001706:Biopsy; D003937:Diagnosis, Differential; D005080:Exercise Test / Q000379:methods / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D054988:Idiopathic Interstitial Pneumonias / Q000175:diagnosis; D054990:Idiopathic Pulmonary Fibrosis / Q000175:diagnosis* / Q000473:pathology; D008168:Lung / Q000000981:diagnostic imaging / Q000473:pathology; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D012129:Respiratory Function Tests / Q000379:methods / Q000706:statistics & numerical data; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods