A peak flow meter is a small, easy-to-use instrument that measures the peak expiratory flow-how fast you blow out air after a maximum inhalation. It shows how well your child’s lungs are functioning. A daily (or regular) documentation of peak flow numbers can give you an important early warning sign. Occasionally, peak flow numbers will reduce in the hours, or even a day or two, prior to other asthma symptoms become obvious. When you observe peak flow numbers on a daily (or regular) basis, you can recognize this fall and take action to avoid an asthma episode.
The maximum number your child can blow on a regular basis is the “personal best.” This is determined by recording peak flow numbers daily for two to three weeks when the asthma is under good control. Consult your physician about a practical training for how to determine your child’s “personal best.”
