Diabetes

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Blood test	Diabetic blood circulation in foot	Diabetic retinopathy	Endocrine glands
Food and insulin release	Glucose test	Insulin production and diabetes	Insulin pump
Insulin pump	Islets of Langerhans	Monitor blood glucose - series	Pancreas
Type I diabetes

High blood levels of glucose can cause several problems, including:

• Blurry vision
• Excessive thirst
• Fatigue
• Frequent urination
• Hunger
• Weight loss

However, because type 2 diabetes develops slowly, some people with high blood sugar experience no symptoms at all.

Symptoms of type 1 diabetes:

• Fatigue
• Increased thirst
• Increased urination
• Nausea
• Vomiting
• Weight loss in spite of increased appetite

Patients with type 1 diabetes usually develop symptoms over a short period of time. The condition is often diagnosed in an emergency setting.

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Symptoms of type 2 diabetes:

• Blurred vision
• Fatigue
• Increased appetite
• Increased thirst
• Increased urination

A urine analysis may be used to look for glucose and ketones from the breakdown of fat. However, a urine test alone does not diagnose diabetes.

The following blood tests are used to diagnose diabetes:

• Fasting blood glucose level -- diabetes is diagnosed if higher than 126 mg/dL on two occasions. Levels between 100 and 126 mg/dL are referred to as impaired fasting glucose or prediabetes. These levels are considered to be risk factors for type 2 diabetes and its complications.
• Oral glucose tolerance test -- diabetes is diagnosed if glucose level is higher than 200 mg/dL after 2 hours. (This test is used more for type 2 diabetes.)
• Random (non-fasting) blood glucose level -- diabetes is suspected if higher than 200 mg/dL and accompanied by the classic diabetes symptoms of increased thirst, urination, and fatigue. (This test must be confirmed with a fasting blood glucose test.)

Persons with diabetes need to have their hemoglobin A1c (HbA1c) level checked every 3 - 6 months. The HbA1c is a measure of average blood glucose during the previous 2 - 3 months. It is a very helpful way to determine how well treatment is working.

Review Date: 05/20/2009
Reviewed By: Reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc. Also reviewed by Deborah Wexler, MD, Assistant Professor of Medicine, Harvard Medical School, Endocrinologist, Massachusetts General Hospital.