A nurse is instructing a school-age child who has asthma about the use of a peak expiratory flow meter. Which of the following instructions should the nurse include in the teaching?

Correct peak expiratory flow meter technique requires a maximal, forceful exhalation — the client takes a deep breath and blows out as hard and fast as possible. The tongue must be placed below the mouthpiece opening (not on it) to prevent obstructing airflow. The test should be performed standing (not semi-Fowler's) to maximize lung capacity. The highest of three readings (not the average) is recorded and compared to the client's personal best.