PFTsExpiration solid · inspiration dashedSynthetic illustration
Wheezing that never responds
advancedA 31-year-old treated for 'refractory asthma' with normal ACT scores between spells. Inspiratory stridor during episodes.
Pulmonary function
FEV13.10L92% pred
FVC3.80L94% pred
FEV1/FVC82%
DLCO97% pred
Interpretation here uses the common teaching thresholds (0.70 ratio, 80% predicted); formal reports use lower limits of normal.
Flow-volume loop