Personal best peak expiratory flow (PEF): Personal best peak expiratory flow (PEF) the highest peak flow number a person can achieve when symptoms are under good control. The personal best PEF is the number to which all other peak flow readings will be compared. In children, peak expiratory flow rates are based on how tall the child is. Therefore, the personal best peak expiratory flow will change as growth occurs. A child’s personal best peak expiratory flow should be redetermined approximately every 6 months or when a growth spurt has occurred.
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