1. Ensure the pointer is set at zero.
2. Hold the Peak Flow Meter so that your fingers are clear of the scale and slot. Alternatively hold using the handle. Do not obstruct the holes at the end of the Peak Flow Meter, or the vents at the side of the mouthpiece.
3. Stand up if possible. Take a deep breath, place the Peak Flow Meter in the mouth and hold horizontally, closing the lips around the mouthpiece, then blow as hard and as fast as you can.
4. Note the number on the scale indicated by the pointer.
5. Return the pointer to zero (L/MIN position) and repeat the procedure twice more to obtain three readings. Mark the highest of the three readings on your Peak Flow Diary.
Click below to download a Peak Flow Diary
