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If you take to manage type 2 diabetes, your doctor may recommend blood sugar testing several times a day, depending on the type and amount of you use. Testing is usually recommended before meals and at bedtime if you're taking multiple daily injections.

Hatipoglu. Over time, diabetes damages the small blood vessels in your body, causing the walls of the blood vessels to stiffen. This increases pressure, which leads to high blood pressure. The combination of high blood pressure and type 2 diabetes can greatly increase your risk of having a heart attack or stroke.

Dexcom G6 Continuous Glucose Monitor doesn't require any blood to monitor blood sugar levels. CNBC's Erin Black, who has Type 1 Diabetes, puts it to the test to see if it's as accurate as previous glucose monitors that require a finger prick and blood.

Those that experience significant discomfort or anxiety as a result of regular finger prick testing may be able to use different parts of the body to test sugar levels, such as the palm of the hand and the forearm. This is known as alternate site testing and tends to be less painful than finger prick tests.

Before each meal. 1 or 2 hours after a meal. Before a bedtime snack. In the middle of the night. Before physical activity, to see if you need a snack. During and after physical activity. If you think your blood sugar might be too high, too low or falling. When you're sick or under stress.

U.S. regulators have approved the first continuous blood sugar monitor for diabetics that doesn't need backup finger prick tests. Current models require users to test a drop of blood twice daily to calibrate, or adjust, the monitor.

AST (Alternate Site Testing) means using a part of the body other than the fingertips to obtain blood for blood sugar testing. This may include taking a blood sample from anywhere other than the fingertips, including the palm, the upper forearm, the abdomen, the calf and the thigh.

Fasting blood sugar (in the morning, before eating): under 100 mg/dL. 1 hour after a meal: 90 to 130 mg/dL. 2 hours after a meal: 90 to 110 mg/dL. 5 or more hours after eating: 70 to 90 mg/dL.

It's called the dawn phenomenon or the dawn effect. It usually happens between 2 and 8 a.m.