Predictive Normal Values have been calculated for women and men of different ages and heights, and have been adapted (with agreement from the original Authors) for use with the new EU Scale / EN 23747 peak flow meters.
One suggestion is to measure your peak flow rate twice daily between 7 and 9 a.m. and between 6 and 8 p.m. You may want to measure your peak flow rate before or after using your medicine, or both. Try to do it the same way each time. Step 7: Keep a chart of your peak flow rates. Discuss the readings with your healthcare provider.
Normal readings of peak flow meters depend on a person's age, sex, and height. For example, a 30 year old male that is 5'10'' tall should have a reading close to 622 liters per minute. Check the charts below for normal peak flow values (click on images to enlarge). Normal readings of peak flow meters are within 80-100% of the baseline reading.
Peak flow meters for monitoring your PEFR are usually recommended for adults and children who are 5 years old or older and have moderate to severe asthma, or in cases where your symptoms aren't under control and you're having your medication adjusted.
Or in the case of a male aged 27 with a height of 186 cm. His predicted peak flow value would be 639.948 L/min. But if he already has a measured peak flow of 568 L/min, the percentage is 88.76. References. 1) Nunn AJ, Gregg I. (1989) New regression equations for predicting peak expiratory flow in adults. BMJ; 298(6680):1068-70.