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FEV1 is the volume of air expelled in the first second of maximal forced expiration
from a position of full inspiration.
In normal subjects the fraction of
the FVC which can be expelled in one second is:
- is reduced in obstructive respiratory disease
e.g. asthma, mild to moderate chronic obstructive pulmonary disease (COPD)
reduced in restrictive respiratory disease e.g. pulmonary fibrosis
with maximal exercise capacity
- The Practitioner
Last reviewed 01/2018