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Last updated: 02/17/2009
The results of spirometry tests are compared to predicted values based on the patient's age, gender, and height. For example, a young adult in good health is expected to have the following FEV values:
- FEV-0.5—50-60% of FVC
- FEV-1—75-85%...
of FVC - FEV-2—95% of FVC
- FEV-3—97% of FVC
In general, a normal result is 80–100% of the predicted value. Abnormal values are:
- mild lung dysfunction—60–79%
- moderate lung dysfunction—40–59%
- severe lung dysfunction—below 40%
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Spirometry (meaning the measuring of breath) is the most common of the Pulmonary Function Tests (PFTs), measuring lung function, specifically the measurement of the amount (volume) and/or speed (flow) of air that can be inhaled and exhaled. Spirometry is an important tool used for generating pneumotachographs which are helpful in assessing conditions such as asthma, pulmonary fibrosis, cystic fibrosis, and COPD.
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