From Kathleen MacNaughton, R.N., former About.com Guide
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
If you cough or make a mistake, do not include this as one of your three tries. You will know you have done things right when all three of your readings are pretty close to each other.
Remember – you can't breathe out too hard or too much. But, you can breathe out too slow or too little. So, just be sure that you always breathe out as fast and hard as you possibly can.
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