The Nurse Is Teaching a Patient with Asthma How to Measure

The nurse is teaching a patient with asthma how to measure peak expiratory flow rate (PEFR) .What should be included in the teaching plan? (Select all that apply.)

A) Assume a recumbent position before measuring PEFR.
B) Take a deep breath in,exhale,then place the mouthpiece in the mouth and form a firm seal with the lips.
C) After placing the mouthpiece in the mouth,blow out as hard and as fast as possible through the mouth in only one single breath.
D) Measure PEFR three times and record the highest number.