What should I know about high fasting blood glucose levels with diabetes?


In general the goal for all of us, including those with diabetes is to try keep our fasting blood sugar stable at 100 or below.

There are two basic tests to measure blood glucose or blood sugar levels.

1.)   The A1C test which reflects your average blood sugar levels over the last 3 months.

2.)   The blood glucose test that you can do yourself at home.

Usually, fasting blood glucose levels of:

100 mg/dl are considered Normal

100-125 mg/dl = pre-diabetic

Over 126 mg/dl = diabetic

Hemaglobin A1C or  A1C numbers that your health provider can measure are usually as follows:

Normal = 6 or less

Pre-Diabetic = 7

Diabetic = more than 7

Additional information on blood sugar numbers can be found here :


Dr. Jack Merendino, MD
Endocrinology Diabetes & Metabolism
One specific pattern of glucose fluctuations needs special consideration: high fasting blood glucose values. It seems perfectly logical for blood sugar levels to rise after eating, but many people are surprised to find that they have higher glucose levels when they get up than they do before other meals of the day, such as dinner. Higher blood sugar levels in the morning mean that you have less insulin action in your body overnight. We often see this in people treated with medications such as the sulfonylureas, which are more effective at promoting insulin release following eating than during prolonged fasting.
In addition, there are two special conditions that may raise fasting glucose levels. The first is called the dawn phenomenon, which results from an increase in certain hormones in the body, especially the stress hormone cortisol, beginning at three or four o'clock in the morning. Cortisol increases insulin resistance, often causing a rise in blood sugar values. The other problem is called the Somogyi effect. This refers to a blood sugar level that rises in the early morning after the person experiences an unrecognized hypoglycemic event during the night. High morning glucose values should prompt some testing at bedtime and then a few tests at 2 or 3 A.M., just to rule out nocturnal hypoglycemia. Clues to nighttime hypoglycemia include fitful sleep, nightmares, or awakening drenched in sweat.
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The Best Life Guide to Managing Diabetes and Pre-Diabetes

Bob Greene has helped millions of Americans become fit and healthy with his life-changing Best Life plan. Now, for the first time, Oprah's trusted expert on diet and fitness teams up with a leading...

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Diabetes mellitus (MEL-ih-tus), often referred to as diabetes, is characterized by high blood glucose (sugar) levels that result from the body’s inability to produce enough insulin and/or effectively utilize the insulin. Diabetes ...

is a serious, life-long condition and the sixth leading cause of death in the United States. Diabetes is a disorder of metabolism (the body's way of digesting food and converting it into energy). There are three forms of diabetes. Type 1 diabetes is an autoimmune disease that accounts for five- to 10-percent of all diagnosed cases of diabetes. Type 2 diabetes may account for 90- to 95-percent of all diagnosed cases. The third type of diabetes occurs in pregnancy and is referred to as gestational diabetes. Left untreated, gestational diabetes can cause health issues for pregnant women and their babies. People with diabetes can take preventive steps to control this disease and decrease the risk of further complications.

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.