"Reference ranges for spirometry across all … It is expressed as percentage. Lung capacity varies widely depending on a person’s age, sex, weight and activity level. Peak expiratory flow rate: Normal 500 to 600 liter… 1999. Eur Respir J. Falaschetti E, Laiho J, Primatesta P, Purdon S. Prediction equations for normal and low lung function from the Health Survey for England. Thorax 2008; 63: 1046-1051. It is based on a regression model from a cohort of subjects aged 18-60, and included height, age and gender. x 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. The predicted FEV1 is calculated using the formula FEV1{litres} = 3.95*height{metres} - 0.025*age{years} - 2.60. FEV1 stands for Forced Expiratory Volume in 1 second. FeV1/FVC ratio is important as this ratio is decreased in obstructive lung diseases. (February 2008). See main article: Wikipedia:Spirometry Reference. Using the lower limit of normal for the FEV1/FVC ratio reduces misclassification of airway obstruction. 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). 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%). volume (FEV1). The machine predicted a person your age, height, and gender could blow 2.57 liters. The formula for the predicted FEV1 is published by the Association for Respiratory Technology and Physiology (www.artp.org.uk). When compared to the reference value, a lower measured value corresponds to a more severe lung abnormality. The ratio of FEV1 to FVC as a basis for establishing Chronic Obstructive Pulmonary Disease. 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. In your case, you blew 2.15 liters in one second. What you scored is divided into the predicted number for a percentage. Y-axis is expressed in Litres for FVC and FEV1, and in Litres/second for FEF25–75%. I hope you can work it out from this. In other words...it is a measurement of how many LITERS you can blow in 1 second. 2004 Mar;23(3):456-63. If the FVC and the FEV1 are within 80% of the reference value, the results are considered normal. 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. 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%. PubMed ID: 15065839 The normal value for the FEV1/FVC ratio is 70% (and 65% in persons older than age 65). It is based on a regression model from a cohort of subjects aged 18-60, and included height, age and gender. Hi you need to divide the bigger number (predicted) into your actual FEV1 2.77 to work out the percentage. Stanojevic S, Wade A, Stocks J, et al. FEV 1 PREDICTED VALUES MALE CAUCASIAN Figures based on prediction equations from Hankinson et al. 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). The normal volume time curve has a rapid upslope and approaches a plateau soon after exhalation. Vaz Fragoso CA, Concato J, McAvay G, Van Ness PH, Rochester CL, Yaggi HK, Gill TM. 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