ETIOLOGIC CLASSIFICATION OF DIABETES: DIAGNOSTIC CRITERIA
Diabetes Mellitus
There are three ways to diagnose diabetes:
1. Symptoms of diabetes with a casual (any time of the day) plasma glucose >=200 mg/dl.
2. Fasting plasma glucose (FPG) >= 126 mg/dl on at least two occasions. Fasting = no caloric intake for at least 8 hr.
3. 2 hour plasma/glucose (PG) > 200 mg/dl after 75 gm of oral glucose in water oral glucose tolerance test (OGTT).
Impaired Glucose Tolerance
Diagnostic test: 75 gm glucose orally Time Plasma glucose (mg/dl)
Fasting < 120 mg/dl 2 hour 140-200 mg/dl
Etiologic Classification of Diabetes
1. Type 1 (Beta cell destruction, usually leading to insulin deficiency)
• Immune-mediated
• Idiopathic
2. Type 2 (may range from predominantly insulin resistance with relative insulin deficiency to , a predominantly insulin secretion defect, with insulin resistance).
3. Other specific types
• Genetic defects of beta cell function
• Genetic defects in insulin action
• Diseases of the exocrine pancreas
• Endocrinopathies
• Drug or chemical-induced
• Infections
• Uncommon focus of immune-mediated diabetes
• Genetic syndromes sometimes associated with diabetes
• Others
4. Gestational diabetes mellitus (GDM)
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