You should speak to your doctor, but it's usually right before you eat your main meals, breakfast, lunch and dinner and 2 hours after you eat. No matter how often you take your glucose it's usually right before a meal and/or 2 hours after, sometimes your doctor may want you to take it as soon as you wake up or right before you go to bed.
If you don't feel well you should take it more often and speak to your endocrinologist or diabetic teacher about this. You need a plan on what to do in advance, so you will know how to take care of problems before they happen.
Please check out the sites below from the American Diabetes Assoc. it helped me when I was diagnosed. I hope this helped. Good luck.
· 1 decade ago