Guide to Asthma

Appendix 2: Tables of normal peak flow values*

* Note that the values shown are the average normal values for healthy persons of a given age and height. There will always be a range of normal values; not everyone can be expected to have exactly the same value. Men can have peak flow values as low as 100 liters/minute less than the average value shown and still fall within the normal range. Women can have peak flow values as low as 80 liters/minute less than the average value shown and still fall within the normal range. To calculate a "normal" value for a healthy person of a given age and height, follow this link.