A patient with type 1 diabetes mellitus presents to the ED w…

A patient with type 1 diabetes mellitus presents to the ED with deep, labored breathing, confusion, and a glucose level of 720 mg/dL. ABG results show pH 7.10, HCO? 12 mEq/L, PaCO? 28 mmHg. The nurse differentiates between diabetic ketoacidosis (DKA) and hyperosmolar hyperglycemic state (HHS) based on which finding?