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JAMA Diagnostic Test Interpretation
June 9, 2015

Pulmonary Function Tests for Diagnosing Lung Disease

Author Affiliations
  • 1The Pulmonary Center, Department of Medicine, Boston University School of Medicine, Boston, Massachusetts
  • 2Associate Editor, JAMA
JAMA. 2015;313(22):2278-2279. doi:10.1001/jama.2015.4466

A 67-year-old man with a 45-pack-year smoking history presented with worsening dyspnea. His resting oxygen saturation was 94%, declining to 86% after walking for 60 meters. A pulmonary examination revealed inspiratory crackles at the bases and diminished breath sounds at the apices. A cardiovascular examination showed normal results, without peripheral edema. A chest x-ray showed hyperinflation and increased interstitial markings. Pulmonary function tests were obtained (Table; Figure).