Thorax (1975), 30, 548.
Variability of routine pulmonary function tests1 JOHN BUTLER
JOHN HRUBY and
Division of Respiratory Diseases, Department of Medicine, University of Washington, Seattle, Washington 98195, USA
Hruby, J. and Butler, J. (1975). Thorax, 30, 548-553. Variability of routine pulmonary functon tests. Pulmonary function tests sometimes indicate a progressive deterioration and at other times a 'stepwise' worsening which may be followed by improvement. Interpretation depends on the extent of random or diurnal variations in function. Routine pulmonary function tests (VC, FEV,, FRC, and airway resistance (Raw)) were repeatedly measured in normal subjects, patients with stable irreversible airways obstruction, and patients with stable restrictive disease. In all groups there was a significant (P
Variability of routine pulmonary function tests1 JOHN BUTLER
JOHN HRUBY and
Division of Respiratory Diseases, Department of Medicine, University of Washington, Seattle, Washington 98195, USA
Hruby, J. and Butler, J. (1975). Thorax, 30, 548-553. Variability of routine pulmonary functon tests. Pulmonary function tests sometimes indicate a progressive deterioration and at other times a 'stepwise' worsening which may be followed by improvement. Interpretation depends on the extent of random or diurnal variations in function. Routine pulmonary function tests (VC, FEV,, FRC, and airway resistance (Raw)) were repeatedly measured in normal subjects, patients with stable irreversible airways obstruction, and patients with stable restrictive disease. In all groups there was a significant (P
