What is the FEV1/FVC Ratio in spirometry and what does it tell you?
The FEV1/FVC ratio is typically expressed as a percentage (such as 75%). Nearly three-fourths of lung volume can normally be exhaled during the first second of the spirometry test. As such, the normal ratio falls between 65 to 85 percent. The range of normal FEV1/FVC ratio is determined by the patient’s age.
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