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What is dangerously high blood sugar?

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Quick Answer

A blood sugar level over 600 milligrams per deciliter can result in a life-threatening coma and dehydration. This condition is known as diabetic hyperosmolar syndrome. A person with this condition has blood that becomes thick like syrup, reports Mayo Clinic.

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Symptoms of diabetic hyperosmolar syndrome include thirst, fever, dry mouth, confusion and loss of vision, according to Mayo Clinic. Patients with these symptoms and a high sugar level need immediate medical attention. Diabetic hyperosmolar syndrome is most common in older adults with Type 2 diabetes. The condition is treated with intravenous fluids to treat the dehydration and intravenous insulin to manage sugar levels.

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