Definition of Meter, peak-flow

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Meter, peak-flow: 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.