Hi, I’ve had tests at dif. labs. I think that they each post their ranges for givens in their lab conditions. They may use dif. equipment or have some variables in their procedure. But it would be a good ? to get a MD and lab answer on. My endo has a lab in his office and also sends out work, so when he calls this week, if he gives me a chance, I’ll ask him. Thanks for all your info and support. Jeannette.