In the current (September 08) issue of Consumer Reports on page 47 there is a report on blood pressure monitors and glucometers. The results require action on the part of ANYONE with diabetes. The glucometers as a whole failed miserably. My doctor was almost apoplectic when he told us about it; this IS resulting in grossly incorrect treatment of diabetics, even with a functional practitioner.
I recommend that you get this particular issue off the newsstand and read the article. Your glucometer will probably need replacing. Since they make their money from the test strips, the meters are relatively inexpensive, and you can get a good deal; you did know that the test strips and lancets are usually covered by insurance, if you have a prescription for them??
The top most accurate glucometers:
diabetic alliance http://www.diabeticalliance.com
The magazine has all sorts of other useful articles this month as well.