FEV1/FVC ratio: Difference between revisions
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==Overview== | ==Overview== | ||
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The '''FEV1/FVC ratio''' is a calculated ratio used in the diagnosis of [[obstructive lung disease|obstructive]] and [[restrictive lung disease]]. | 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]] | 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> | ||
In | ==Disease States== | ||
In [[obstructive lung disease]], the FEV1 is reduced due to obstruction to air escape. Thus, the FEV1/FVC ratio will be reduced.<ref> http://www.gp-training.net/protocol/respiratory/copd/spirometry.htm </ref> | |||
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.<ref> http://www.gp-training.net/protocol/respiratory/copd/spirometry.htm </ref> | |||
== References == | == References == | ||
{{reflist}} | {{reflist|2}} | ||
{{Respiratory physiology}} | {{Respiratory physiology}} | ||
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[[Category:Pulmonology]] | |||
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Latest revision as of 02:32, 9 August 2012
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
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