Testing prior to meals is important because fasting blood glucose levels give you a better picture of the treatment you need. If you choose to test after a meal, you should wait one to two hours to make sure you get an accurate blood sugar reading.
So you may need to test before meals and snacks, before and after exercise, before bed, and sometimes during the night. You may also need to check your blood sugar level more often if you are ill, change your daily routine or begin a new medication.
If you are feeling sick, you should increase the frequency of your blood sugar testing until you're feeling better.
Blood sugar testing is a fundamental part of treating diabeties. By obtaining regular blood sugar readings, people with diabetes can, among other things, help make more informed decisions regarding the type and dosage of medication they need. Blood sugar testing also can help you see what foods, events, and activities trigger highs and lows in your blood sugar levels.