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Basic Peak Expiratory Flow Predicted Values Calculator - USA Reference

About Peak Expiratory Flow (PEF)
Peak Expiratory Flow is usually defined at the maximum air flow rate that a person can exhale over a period of 10milliseconds. The peak flow is commonly used as a measure of ventilatory capacity because it can be measured by low cost devices that are readily available. Peak flow is often used to measure a patients response to bronchodilator therapy- where PEF values are taken before and after therapy. 
Examples of some low cost mechanical, peak flow meters to measure PEF are available here. Higher priced electronic peak flow meters and spirometers will produce more precise results. Peak flow is a less satisfactory measure of ventilatory capacity due to its variabilty, and so other measures are preferred such as Forced Expriatory Volume with (FEV1). 

The National Health and Nutrition Examination Survey (NHANES) is a program that included spirometric studies of various populations in the United States. The survey results from 1999 were taken as the standard reference for predicted values by the American Thoracic Society (ATS). This calculator computes peak expiratory flow (PEF) predicted values based on the NHANES III report1. The required inputs are age, height, and sex.

For other spirometric predicted values such as FEV1 (that from the NHANES and other predicted reference values sources) please use the advanced calculator.

Required inputs:

Date of birth





Hankinson 1999 (NHANES III) J.L. Hankinson, J.R. Odencrantz, and K.B. Fedan, Spirometric Reference Values from a Sample of the General U.S. Population. Am J Respir Crit Care Med, Vol 159, pp. 179-187, 1999.

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