A plethysmograph is an instrument for measuring changes in volume within an organ or whole body (usually resulting from fluctuations in the amount of blood or air it contains). There are some kinds of plethysmographs, depending on their performance and the part of the body or the organ they study.
Pulmonary plethysmographs are commonly used to measure the functional residual capacity (FRC) of the lungs—the volume in the lungs when the muscles of respiration are relaxed—and total lung capacity.
Some plethysmograph devices are attached to arms, legs or other extremities and used to determine circulatory capacity. Plethysmography is a non-invasive method used to detect venous thrombosis in these areas of the body.
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