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PEFR monitoring in asthma

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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The measurement of peak expiratory flow rate (PEFR) three to four times per day allows the diagnosis and assessment of the severity of asthma.

Untreated asthma is characterised by:

  • greater than 10% diurnal variability in PEFR
  • lowest values in the morning

A diagnostic trial of oral corticosteroids should show an upward trend in the mean PEFR in asthma.

Reference

  1. National Institute for Health and Care Excellence. Asthma: diagnosis, monitoring and chronic asthma management. Mar 2021 [internet publication].

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