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Forced expiratory volume in one second

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

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:

  • >80 % predicted value

FEV1:

  • is reduced in obstructive respiratory disease e.g. asthma, mild to moderate chronic obstructive pulmonary disease (COPD)
  • is reduced in restrictive respiratory disease e.g. pulmonary fibrosis
  • correlates with maximal exercise capacity

Reference:

  1. The Practitioner 2005; 249:180-188.

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