Here is some more information on blood
glucose ranges and blood sugar testing for you from MedHelp.org and the Sugar Sense
app.
http://www.medhelp.org/diabetes/articles/Be-Blood-Sugar-Savvy/1777
If you enter enough data over enough days, our app gives you an average A1C -- this is your 3 month average amount of glucose in your blood. It's likely a better measure than the daily averages from your meter, as Mindmaster points out. Here's a little more about the A1C:
http://www.medhelp.