The Nurse Uses a Peak Flow Meter During a Respiratory

The nurse uses a peak flow meter during a respiratory assessment. She instructs the patient to do which of the following? Select all that apply.

A) Take a deep breath and hold it.
B) Place the meter in the mouth with the tongue under the mouthpiece.
C) Close the lips tightly around the mouthpiece.
D) Blow slowly until as much air as possible is exhaled.