2004 Mar;23(3):456-63. The ratio of FEV1 to FVC as a basis for establishing Chronic Obstructive Pulmonary Disease. FEV 1 PREDICTED VALUES MALE CAUCASIAN Figures based on prediction equations from Hankinson et al. Falaschetti E, Laiho J, Primatesta P, Purdon S. Prediction equations for normal and low lung function from the Health Survey for England. Normal lung capacity is between 4 and 6 liters, and the average human total lung capacity is approximately 5.8 liters, according to The Physics Factbook. Hi you need to divide the bigger number (predicted) into your actual FEV1 2.77 to work out the percentage. In other words...it is a measurement of how many LITERS you can blow in 1 second. volume (FEV1). x Stanojevic S, Wade A, Stocks J, et al. English: Normal values for Forced Vital Capacity (FVC), Forced Expiratory Volume in 1 Second (FEV1) and Forced Expiratory Flow 25–75% (FEF25–75%). For example if your fev1 is 2.15 litres and the predicted for your group is 2.77 then you divide the 2.77 into 2.15 and the result would be 83.66%. It is based on a regression model from a cohort of subjects aged 18-60, and included height, age and gender. The normal volume time curve has a rapid upslope and approaches a plateau soon after exhalation. PubMed ID: 15065839 Similarly, if the patient is being evaluated for lung resection, you like them to end up with an FEV1 > 0.8 or 1.0 liters. Therefore, a patient with an FEV1 of 1.2 liters would be very high risk for a pneumonectomy (predicted post-op FEV1 = 0.6 L) but only moderate risk for a lobectomy (predicted post-op FEV1 = 1.0 L). The normal value for the FEV1/FVC ratio is 70% (and 65% in persons older than age 65). If the FVC and the FEV1 are within 80% of the reference value, the results are considered normal. Y-axis is expressed in Litres for FVC and FEV1, and in Litres/second for FEF25–75%. FEV1 stands for Forced Expiratory Volume in 1 second. In your case, you blew 2.15 liters in one second. Using the lower limit of normal for the FEV1/FVC ratio reduces misclassification of airway obstruction. The machine predicted a person your age, height, and gender could blow 2.57 liters. (February 2008). Eur Respir J. The formula for the predicted FEV1 is published by the Association for Respiratory Technology and Physiology (www.artp.org.uk). Thorax 2008; 63: 1046-1051. FeV1/FVC ratio is important as this ratio is decreased in obstructive lung diseases. 1999. It is based on a regression model from a cohort of subjects aged 18-60, and included height, age and gender. See main article: Wikipedia:Spirometry Reference. It is expressed as percentage. Peak expiratory flow rate: Normal 500 to 600 liter… "Reference ranges for spirometry across all … What you scored is divided into the predicted number for a percentage. Lung capacity varies widely depending on a person’s age, sex, weight and activity level. The predicted FEV1 is calculated using the formula FEV1{litres} = 3.95*height{metres} - 0.025*age{years} - 2.60. The predicted FEV1 is calculated using the formula FEV1{litres} = 4.30*height{metres} - 0.029*age{years} - 2.49. The formula for the predicted FEV1 is published by the Association for Respiratory Technology and Physiology (www.artp.org.uk). I hope you can work it out from this. Normal person can exhale 83 to 85%of FVC in 1 second (so FeV1 is 83 to 85%), 93% in 2 seconds (FeV2 is 93%) and 97% in 3 seconds (FeY3 is 97%). Vaz Fragoso CA, Concato J, McAvay G, Van Ness PH, Rochester CL, Yaggi HK, Gill TM. The higher the percentage derived from your FEV1/FVC ratio, in the absence of restrictive lung disease that causes a normal or elevated FEV1/FVC ratio, the healthier your lungs are. When compared to the reference value, a lower measured value corresponds to a more severe lung abnormality. 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