After you measure TV and vital capacity, you must also calculate before you can determine total lung capacity.

Question

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To determine total lung capacity, you must know the residual volume in addition to the tidal volume (TV) and vital capacity, because total lung capacity is the sum of vital capacity and residual volume. Residual volume is the amount of air remaining in the lungs after a maximal exhalation, which cannot be measured directly by spirometry.

After You Measure TV and Vital Capacity, You Must Also