Forced Expiratory Volume 1 Second

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Contents 1 Indications 2 Notes 3 More General Terms 4 References

Indications

• FEV1 is used in connection with FVC for assessing obstructive lung disease. Clinical signicance:

* 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

More General Terms

• pulmonary function test (PFT)

References

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

forced expiratory volume in 1 second (FEV1)