flow-volume loop


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flow-volume loop

a graph of the rate of airflow as a function of lung volume during a complete respiratory cycle consisting of a forced inspiration followed by a forced expiration. The plotted curve appears as a loop and is used in assessing pulmonary function.

flow-volume loop

A graphic record of lung function in which the amount of gas inhaled and exhaled is recorded on the horizontal axis and the rate at which the gas moves on the vertical axis. It is used to detect abnormalities in pulmonary function such as those accompanying restrictive or obstructive lung disease.
See also: loop
References in periodicals archive ?
These studies looked at the effect that different gases have on the shape and characteristics of flow-volume loops.
It becomes very evident that a patient is trying to change his spirometric results by observing the variation in flow-volume loop shape.
Clues for asthma include peak flow changes of >20% with symptoms, flow-volume loops, and atopic status.

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