PFTs, or pulmonary function tests, gauge how effectively the lungs operate. The client can breathe regularly and silently during several of the test measurements. For other tests, a deep breath must be followed by a forceful inhalation or exhalation. In order to see how test findings are affected, patients may occasionally be asked to breath a different gas or medication. Spirometry calculates lung size and measures air flow rate. The client will breathe through a tube that is attached to a computer several times while exerting consistent, maximum effort. The necessary breathing effort can make some people feel dizzy or exhausted. The most precise method of determining how much air the lungs can store is through lung volume tests. Two methods exist for measuring lung volume: 1. Body plethysmography is the most precise method. You sit in what appears to be a phone booth—a clear, sealed enclosure.
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