I have a document that talks about it but here it is:

You take in a normal breath and then as you normally breath out you count as far as you can. A mistake I made at first was being in distress from the breathing so I would rush the counting. Do it in a normal way. I was 16 will I was waiting to get to hospital area. A student did this test to me. Strangely no other doc there has done it with me.

My understanding is that 10 is a point at which you should be in ER/ICU. I believe it was a respiratory tech with MG that told me this.

http://www.ncbi.nlm.nih.gov/pubmed/20825771

http://www.google.com/#hl=en&sugexp=...f657eb4d8c6f0d

Here is a paper and search of other ones. I didnt find the one written by the neuro I have.

Annie59 take care