Omron Peak-Air PF9940, Instruction Manual, Page: 4 / 8

Take a few moments to apply the accompanying personalized self-stick information labels
and circle-shaped labels. Your physician will assist you in positioning the color zone
labels along the scale.
1. Attach the appropriate size plastic mouthpiece on the
input side of the peak flow meter, the side clearly
marked with the arrow (
). Both adult and pediatric
mouthpieces are tapered. Please be sure to insert the
wide end into the meter.
2. Make sure the sliding indicator is at the bottom (zero)
side of the scale.
3. Hold the peak flow meter so that your fingers do not
block the outlet opening or prevent the sliding indicator
from moving the full length of the scale. It is best to grasp the meter around the round
handle of the device.
4. While standing, inhale as deeply as possible, then place your mouth firmly around the
mouthpiece, making sure that your lips form a tight deal. The mouthpiece should be
inserted past the teeth.
5. BLOW OUT AS HARD AND FAST AS POSSIBLE, a short, sharp blast. This will cause
the indicator to move up the scale. NOTE: you do not have to expel all of the air in your
lungs, the indicator will most likely not move after the first few seconds of the effort.
6. The final position of the indicator is your PEFR (peak expiratory flow rate); make
note of this value.
7. Repeat steps 2 through 6 until you have completed three efforts correctly. Allow a minute
or so between efforts to rest. The variation between the readings should not exceed 10%.
HOW TO USE YOUR PEAK-AIR PEAK FLOW METER