The labs are one of the biggest holes in the process. I was diagnosed with hyppthyroidism even though I had vert few of the symptoms and actually demonstrated the exact opposite behaviors of other symptoms. After my PCP referred me to a specialist and I received all of these nuclear tests, the specialist reviews the lab results and indicates that they were impossible! Of the 3 numbers *don't quote me*, two should have been high and the third low...well there were TWO that were low, a physical impossibility based on actual blood chemistry. Fortunately, all that resulted was exposure to some nuclear agents and a missed day's work...
My husband was diagnosed at the same office w/ diabetes. His only risk factor was that he is AA, thats it! I beleive it was incorrect lab results in this instance as well. Fortunately, the doc did a retest and found no signs of the disease.