plethysmography

(noun)

The diagnostic use of a plethysmograph to measure changes in volume within an organ or whole body.

Examples of plethysmography in the following topics:

Factors Affecting Pulmonary Ventilation: Airway Resistance
- Airway resistance can be indirectly measured with body plethysmography, which is an instrument used for measuring changes in volume within a structure, such as the airways.