How to Measure Your Child's Peak Flow

Peak flow, also known as peak expiratory flow, measures how well your child's lungs are working. This is done with a peak flow meter that measures the speed in which your child is able to blow air out of his lungs. The higher the number, the better his lungs are functioning. Parents and children with asthma will need to learn to check peak flow to know if there is a problem that may require medication or medical attention. Knowing how to do this will help your child better manage his asthma.

Things You'll Need

• Disposable mouthpiece covers (optional)

Show More

Instructions

• 1

  Have your child stand up straight. Do not let him lie down or sit.

• 2

  Move the reading indicator to the bottom of the peak flow meter.

• 3

  Instruct your child to fill her lungs with as much air as they will hold.

• 4

  Have him place his lips tightly over the mouthpiece. Make sure that his fingers are not covering the holes in the back of the meter.

• 5

  Tell her to blow into the mouthpiece hard and quick.

• 6

  Repeat Step 5 three times. The highest of the readings is the peak flow reading.

• 7

  Record the highest reading along with the date, time and any symptoms your child may be having, such as shortness of breath. Report the readings to your child's doctor as needed.