Blood sugar testing gives useful information to manage diabetes. It can help you:

Track the effect of diabetes medicine on blood sugar levels.
Adjust doses of diabetes medicines with the guidance of your treatment team.
Find out if blood sugar levels are high or low. Then, if needed, change treatment to treat high blood sugar or take fast-acting carbohydrates to treat low blood sugar.
Track progress in reaching your treatment goals.
Learn how diet and exercise affect blood sugar levels.
Understand how other factors, such as sickness or stress, affect blood sugar levels.