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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.
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