Residual quantity is the quantity of air that continues to be within the lungs after a maximal exhalation. It is a crucial measure of lung perform, as it could possibly assist to establish circumstances that have an effect on the lungs’ capability to develop and contract.
There are a variety of the way to measure residual quantity, however the commonest technique is to make use of a spirometer. A spirometer is a tool that measures the amount of air that’s inhaled and exhaled. To measure residual quantity, the affected person is first requested to exhale as a lot air as doable. Then, the affected person is requested to inhale a recognized quantity of air from the spirometer. The residual quantity is then calculated by subtracting the amount of air that was exhaled from the amount of air that was inhaled.