Types Description and Subtypes Type 1 β-cell destruction, usually leading to absolute insulin deficiency   Autoimmune   Idiopathic Type 2 Ranging from predominantly insulin resistant with relative   insulin deficiency to a predominantly secretory defect with or   without insulin resistance Other Specific Genetic defects of β-cell function Types Genetic defects in insulin action   Diseases of the exocrine pancreas   Endocrinopathies   Drug- or chemical induced   Infections   Uncommon form of immune-mediated diabetes   Other genetic syndromes sometimes associated with   diabetes Gestational Carbohydrate intolerance resulting in hyperglycaemia of Diabetes variable severity with onset or first recognition during   pregnancy Diabetes mellitus is classified into four categories, type I, type 2, other specific types and gestational diabetes

Table 1: Aetiological classification of disorders of glycaemia.

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