Which of the following is the best instruction to give a patient on how to perform a peak flow test?

A. "Take the deepest breath possible. Seal your lips around the mouthpiece. Blow out as hard and as fast as you can."

B. "Take the deepest breath possible. Seal your lips around the mouthpiece. Inhale as much air as you can."

C. "Blow all your air out of your lungs as much as possible. Seal your lips around the mouthpiece. Inhale as hard and as fast as you can."

D. "Take the deepest breath possible. Seal your lips around the mouthpiece. Blow out in short, small puffs."

The best instruction for performing a peak flow test is to take the deepest breath possible, seal your lips around the mouthpiece, and blow out as hard and as fast as you can.

Explanation:

The best instruction to give a patient on how to perform a peak flow test is:

'Take the deepest breath possible. Seal your lips around the mouthpiece. Blow out as hard and as fast as you can.'

This instruction ensures a maximal, forceful, fast expiration, which is essential for an accurate peak flow test.

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