FEV1/FVC ratio: Difference between revisions
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The '''FEV1/FVC ratio''' is a | The '''FEV1/FVC ratio''' is a calculated ratio used in the diagnosis of [[obstructive lung disease|obstructive]] and [[restrictive lung disease]]. | ||
It represents the proportion of the [[FVC|forced vital capacity]] exhaled in the [[FEV1|first second]]<ref> http://www.gp-training.net/protocol/respiratory/copd/spirometry.htm </ref>. | It represents the proportion of the [[FVC|forced vital capacity]] exhaled in the [[FEV1|first second]]<ref> http://www.gp-training.net/protocol/respiratory/copd/spirometry.htm </ref>. | ||
Revision as of 13:21, 7 March 2009
The FEV1/FVC ratio is a calculated ratio used in the diagnosis of obstructive and restrictive lung disease.
It represents the proportion of the forced vital capacity exhaled in the first second[1].
Disease States
In obstructive lung disease, the FEV1 is reduced due to obstruction to air escape. Thus, the FEV1/FVC ratio will be reduced[2].
In restrictive lung disease, the FEV1 and FVC are equally reduced due to fibrosis or other lung pathology (not obstructive pathology). Thus, the FEV1/FVC ratio should be approximately normal[3].
References