Peak flow
Normal values vary based on a person's age, sex, and size. Peak flow measurements are most useful when a person compares the number on a given day to his or her "personal best."
A fall in peak flow can signal the onset of a lung disease flare, especially when it occurs with symptoms such as:
Early treatment may be needed to prevent complications.
Peak air flow during exhalation decreases when...
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Source: ADAM Encyclopedia
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