Enter Age, Height and Gender. To see Percent Prediced, you must enter observed FVC, FEV1, and PEFR values in the appropriate boxes.
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|Measurements made in Spirometry|
|VC (SVC)||Vital capacity (slow vital capacity)||Maximal amount of air exhaled steadily from full inspiration to maximal expiration (not time-dependent). It should be >80% of predicted, reduced in restrictive disease.|
|FVC||Forced vital capacity||Volume of lungs from full inspiration to forced maximal expiration. It is reduced in restrictive disease, and in obstructive disease if air trapping occurs.|
|FEV1||Forced expiratory volume in one second||Volume of air expelled in the first second of a forced expiration. Reduced in both obstructive and restrictive disease.|
|FEV1% (FER)||Forced expiratory ratio (FEV1/FVC)x100||Percentage of FVC expelled in the first second of a forced expiration.
Normal in restrictive disease - reduced in obstructive disease.
|FEF 25-75%||Forced expiratory flow between 25-75%||Average expiratory flow rate at the middle part of forced expiration. It is a more sensitive indication of what is happening in the middle/lower airways, but is not as reproducible as FEV1. Normal in restrictive disease.|
|PEFR||Peak expiratory flow rate||Maximum rate of airflow achieved during expiration.|