| Move peak flow meter indicator to zero. |
| Sit or stand up straight. |
| Take in a deep breath, as deep as you can. |
| Place peak flow meter in your mouth and close your lips around the mouthpiece*. |
| As soon as your lips are sealed around mouth piece, blow out as hard and fast as you can using your chest and belly muscles¶. This should take no more than 2 seconds. |
| Write down the result. |
| Repeat two more times (three total). |
| Record the highest of the three values. |
