Hyperglycemia

Elevated blood glucose above the reference range (fasting: ≤99 mg/dL or ≤5.5 mmol/L, hyperglycemia: >140 mg/dL or 7.8 mmol/L), typically reflecting inadequate insulin action or secretion. Possible causes are diabetes mellitus, missed medication/insulin, sugary diet, insulin resistance, stress releasing cortisol/adrenaline, illness/infection, corticosteroids, and the dawn phenomenon.