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Diabetic ketoacidosis — MRCPCH FOP MCQ

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HardEndocrinology and growthDiabetic ketoacidosisMRCPCH FOP

A 12-year-old girl has polyuria, weight loss and vomiting. Glucose is 28 mmol/L, ketones 5.6 mmol/L, pH 7.18 and bicarbonate 10 mmol/L; she is dehydrated but alert. What is the most likely cause?

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Correct answer: EInsulin deficiency causing ketosis and metabolic acidosis

Hyperglycaemia, marked ketonaemia, acidosis and low bicarbonate confirm DKA, which results from insulin deficiency and counter-regulatory hormone excess. Renal tubular acidosis would not cause severe hyperglycaemia and ketonaemia. Salicylate poisoning produces a different mixed acid-base pattern and does not explain polyuria with hyperglycaemia. The pearl is that DKA management corrects dehydration and insulin deficiency while avoiding rapid osmotic shifts.

Reference: NICE NG18 Diabetes in children and young people; BSPED DKA guideline