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. The word is derived from the Greek "plethysmos" increasing, enlarging, becoming full , and "graphos" to write. 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. In a traditional plethysmograph or "body box" , the test subject, or patient, is placed inside a sealed chamber the size of a small telephone booth with a single mouthpiece. At the end of normal expiration, the mouthpiece is closed. The patient is then asked to make an inspiratory effort. As the patient tries to inhale a maneuver which looks and feels like panting , the lungs expand, decreasing pressure within the lungs and increasing lung volume.
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Pulmonary Function Equipment Buyer's Guide
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