Myasthenia Gravis is easily confirmed . If the ACHr is above 25, MG is positive. However, one can be sero-negative which means it is NOT ACHr positive. Two older diagostic methodologies are the Tensilon and single fiber tests. I was diagnosed positive with the Tensilon test and verified with the ACHr blood test which I had a 49! Oh yes, I certainly Do have MG! I have so much MG information researched from reputable sites, that I present to my MG support group that I started when my MG was stabilized. There several MG websites that have a lot of information. If you are diagnosed with MG (or any other auto-immune disease), EDUCATION on that disease is paramount!! Many things, even many medications can worsen MG, even causing MG crisis so EDUCATE it could save your life!