This hand-held device measures air flow (how fast air is blown out of the
lungs). Patients can use peak-flow meters to measure their own air flow regularly.
The use of a peak-flow meter allows patients to obtain a much earlier indication of an oncoming attack, for example, of exercise-induced asthma, a type of asthma typically triggered by exercise.
The "peak flow" refers to the maximum flow rate of air breathed out during forced expiration.
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