Lung volume refers to the total amount of air that is contained in the lungs. Total lung volume (or capacity) includes the amount of air you breath in as well as the small amount of air that is always stuck in your lungs (residual volume). Lung volumes are often measured as part of lung function tests. To determine your lung volume, gas dilution tests are used where you breathe a certain gas from a container and the change in concentration is measured. From the fall in concentration of gas, the physician can deduce how much space is in your lungs.
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