A nurse is reinforcing teaching with the parent of a school-age child who has asthma about the use of a peak flow meter. Which of the following information should the nurse include in the teaching? (Select all that apply.)

A. The child should record the average of all the readings as their result: The child should record the highest (best) of three valid readings, not the average. B. Blow hard and fast: The child should take a deep breath and blow into the meter as hard and fast as possible. This ensures an accurate measurement of peak flow. C. Repeat three times, 30 seconds apart: The child should perform three attempts, with a brief rest between each. The highest reading (not the average) is recorded as the result. D. The child should sit in a chair while using the meter: Best practice is to stand (or sit upright) to allow full lung expansion; sitting in a slouched position is not ideal.