Ketone Body Metabolism

A 52-year-old woman with Type 2 diabetes on metformin presents with fatigue and mild ketonemia (0.8 mmol/L). Which finding best distinguishes euglycemic diabetic ketoacidosis (euDKA) from classical DKA in this patient?

Which biochemical finding best distinguishes diabetic ketoacidosis (DKA) from starvation ketosis in a 28-year-old man presenting with Kussmaul respiration and ketonemia?

A 28-year-old woman with type 1 diabetes mellitus presents to the emergency department with severe nausea, vomiting, and rapid breathing. Blood glucose is 450 mg/dL, arterial pH is 7.18, HCO₃⁻ is 12 mEq/L, and serum ketones are markedly elevated. She admits to missing insulin injections for 2 days. What is the most appropriate immediate next step in management?

A 52-year-old man with a 10-year history of type 2 diabetes mellitus on metformin and glipizide presents with persistent nausea, fatigue, and a fruity odor on his breath. Laboratory findings show: blood glucose 320 mg/dL, pH 7.28, HCO₃⁻ 14 mEq/L, serum osmolality 340 mOsm/kg, and serum ketones mildly elevated (β-hydroxybutyrate 3.5 mmol/L). Urinalysis shows 3+ glucose and 1+ ketones. The patient is alert and oriented. What is the most appropriate immediate next step?

A 28-year-old woman with type 1 diabetes mellitus presents to the emergency department with a 2-day history of polyuria, polydipsia, and progressive lethargy. She admits to missing insulin injections for 3 days. On examination, she is tachypneic (RR 28/min), blood pressure 110/70 mmHg, and has fruity-smelling breath. Laboratory investigations reveal: blood glucose 580 mg/dL, arterial pH 7.18, HCO₃⁻ 12 mEq/L, and serum ketones strongly positive. Which of the following best explains the biochemical mechanism underlying the elevated ketone bodies in this patient?