The predicted FEV1 is calculated using the formula FEV1{litres} = 4.30*height{metres} - 0.029*age{years} - 2.49. 2004 Mar;23(3):456-63. Hi you need to divide the bigger number (predicted) into your actual FEV1 2.77 to work out the percentage. 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. See main article: Wikipedia:Spirometry Reference. x Stanojevic S, Wade A, Stocks J, et al. The predicted FEV1 is calculated using the formula FEV1{litres} = 3.95*height{metres} - 0.025*age{years} - 2.60. The normal value for the FEV1/FVC ratio is 70% (and 65% in persons older than age 65). "Reference ranges for spirometry across all … The machine predicted a person your age, height, and gender could blow 2.57 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). FeV1/FVC ratio is important as this ratio is decreased in obstructive lung diseases. 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. In other words...it is a measurement of how many LITERS you can blow in 1 second. It is expressed as percentage. FEV1 stands for Forced Expiratory Volume in 1 second. What you scored is divided into the predicted number for a percentage. Thorax 2008; 63: 1046-1051. PubMed ID: 15065839 1999. Falaschetti E, Laiho J, Primatesta P, Purdon S. Prediction equations for normal and low lung function from the Health Survey for England. English: Normal values for Forced Vital Capacity (FVC), Forced Expiratory Volume in 1 Second (FEV1) and Forced Expiratory Flow 25–75% (FEF25–75%). The normal volume time curve has a rapid upslope and approaches a plateau soon after exhalation. Using the lower limit of normal for the FEV1/FVC ratio reduces misclassification of airway obstruction. In your case, you blew 2.15 liters in one second. 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). Vaz Fragoso CA, Concato J, McAvay G, Van Ness PH, Rochester CL, Yaggi HK, Gill TM. Lung capacity varies widely depending on a person’s age, sex, weight and activity level. Eur Respir J. When compared to the reference value, a lower measured value corresponds to a more severe lung abnormality. It is based on a regression model from a cohort of subjects aged 18-60, and included height, age and gender. The ratio of FEV1 to FVC as a basis for establishing Chronic Obstructive Pulmonary Disease. (February 2008). If the FVC and the FEV1 are within 80% of the reference value, the results are considered normal. 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. Y-axis is expressed in Litres for FVC and FEV1, and in Litres/second for FEF25–75%. The formula for the predicted FEV1 is published by the Association for Respiratory Technology and Physiology (www.artp.org.uk). FEV 1 PREDICTED VALUES MALE CAUCASIAN Figures based on prediction equations from Hankinson et al. It is based on a regression model from a cohort of subjects aged 18-60, and included height, age and gender. Peak expiratory flow rate: Normal 500 to 600 liter… I hope you can work it out from this. The formula for the predicted FEV1 is published by the Association for Respiratory Technology and Physiology (www.artp.org.uk). 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