forced expiratory volume in 1 second (FEV1)

Indications: - FEV1 is used in connection with FVC for assessing obstructive lung disease. Clinical significance: FEV1/FVC Assessment > 75% normal 60-74% mild obstruction 45-59% moderate obstruction < 40% severe obstruction Notes: - an isolated decrease in FEF25-75 is indicative of small airway disease

Specific

FEV1 for COPD <40% of predicted FEV1 for COPD >40% of predicted

References

Diagnostic History & Physical Examination in Medicine, Chan & Winkle, Current Clinical Strategies, Laguna Hills, CA 1996