What causes hyperglycemia in pediatric type 1 diabetes mellitus (DM)?

Updated: Jul 03, 2019
  • Author: William H Lamb, MD, MBBS, FRCP(Edin), FRCP, FRCPCH; Chief Editor: Sasigarn A Bowden, MD  more...
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Answer

In an otherwise healthy individual, blood glucose levels usually do not rise above 180 mg/dL (9 mmol/L). In a child with diabetes, blood sugar levels rise if insulin is insufficient for a given glucose load. The renal threshold for glucose reabsorption is exceeded when blood glucose levels exceed 180 mg/dL (10 mmol/L), causing glycosuria with the typical symptoms of polyuria and polydipsia. (See Pathophysiology, Clinical, and Treatment.)

All children with diabetes experience episodes of hyperglycemia, but persistent hyperglycemia in very young children (age < 4 y) may lead to later intellectual impairment. [11, 12]


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