6
Performing the Test
) The subject should sit down when blowing into the device (unless advised otherwise). Insert a new
disposable one-way valve mouthpiece into the device.
) When the device is ready for a test the blow icon shows ( ).
3) Instruct the subject and demonstrate (using a seperate mouthpiece) as follows:
a) “Hold your head up, breathe in as deeply as possible, hold the device in front of your
mouth”.
b) “Hold your breath, place the mouthpiece into your mouth, like this, bite the mouthpiece
lightly, and seal your lips firmly around it, like this”. I will demonstrate.
c) “Blow out as HARD, and FAST as you can, like this, until I tell you to stop” (the unit will beep
at end of test - after 6 seconds).
d) “Be careful not to block the mouthpiece with your tongue or teeth. A ‘spitting’ action will give
false readings”.
e) “Now you do it – deep breath in – bite and seal – blast the air out…keep going – keep
blowing”.
f) “Well done! Now, we need to do that three times. Rest for a while until you are ready to
blow again”.
4) To view the final result (the best values in the session), press the
button.
The Obstructive Index (OI) shows on the left hand arrow.
i) Green is normal.
ii) Yellow, amber or red are not normal and the patient should be referred for spirometry.
5) Following each blow and at the end of the test session, the FEV value will be displayed and
below that, FEV % Predicted results for that blow, or for the best in session if the button has
been pressed. Pressing again will toggle between best and last blow.
6) Press the button to show the estimated Lung Age ( ).
Notes on testing:
) During testing, if an exclamation mark (!) appears, this means that the last blow was not a good
quality blow and the user should blow again. Reasons for poor quality are;
a) Slow start of test
b) Cough detected
) If the test subject experiences side effects such as dizziness or fatigue during the test procedure,
stop testing until recovered.
