| Hey, MJB, when your doctor lowered your metformin, were you then able to maintains such good numbers, or did they come up a little?
The units of measurement are different, babyslon, between how you measure and how davef is measuring. Most of the world uses millimoles per liter (mmol/L), while milligrams per deciliter (mg/dL) is the standard in the standard used in the U.S. (Gotta at least give USAers credit for not reporting in dry ounces per quart or something like that, as they do with everything nonscientific!)
Your numbers, 4.3-5.7 equal 77-102 (Wow! Excellent!) using the same system as Dave. Because there are so many USA people on this site, you will often see number like his posted. Just divide those numbers by 18 to see what they are equivalent to in the units you are familiar with. So davef's 97, for example, would equal a 5.4 to you. | 
