20 May 2019 Plethysmography is a respiratory function test. Plethysmography assesses of lung volume but in more detail than spirometry, as it also estimates the total lung capacity and residual volume (the volume of air left in the lungs after maximum exhalation). It is particularly important in assessing respiratory mechanisms, including: The ability to transport air; Strength of breathing muscles; Airway resistance. How plethysmography works Plethysmography is carried out in a plethysmograph, a s ealed chamber with a known volume, into which the patient is placed for the duration of the examination. While in the plethysmograph, the patient breathes through a nozzle and is asked to perform breathing exercises of varying force that change pressure in the cabin. These changes in pressure make it possible to calculate variations in pulmonary volumes and calculate the parameters being studied. This article was written with the support of physicians and other clinical professionals from the Hospital da Luz network. The content published in the Health Guide is intended for the general public and is provided for informational and educational purposes only. It does not replace individual medical assessment, diagnosis, or personalized clinical advice from a qualified healthcare professional. The content is produced or reviewed by physicians and other healthcare professionals at Hospital da Luz and is based on the knowledge available at the time of publication or the most recent update, as indicated at the beginning of each item.
