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©2013 UpToDate ® Print Email Asthma daily diary II instructions To do a peak flow measurement: • Take a deep breath, seal your lips around the mouthpiece, blow as hard and as quickly as you can (like blowing out a candle), check the number, re-set the pointer to zero and repeat. • Generally, the best of three peak flow values is the one to record on the chart. • Record the date at the top of the chart. • Use an o for first morning values. • Use a • for afternoon or evening values. • Use a Δ for before exercise. • Use an x for after exercise or with symptoms. • If your peak flow is lower than normal, check your action plan or call your asthma care provider. Adapted from: Woolcock Institute of Medical Research, 2006.