Which of the following is a sign of diabetic ketoacidosis?

• A. Kussmaul respirations
• B. Gradual onset
• C. Dry, warm skin
• D. Fruity breath

Answer: (D)

Fruity breath is a hallmark clue for diabetic ketoacidosis. When insulin is deficient, the body pumps fat into ketone production, and acetone—a volatile ketone—builds up and is exhaled, giving a distinctive fruity odor. This odor is highly characteristic of DKA and helps distinguish it from other conditions in the field. While deep, labored breathing (Kussmaul respirations) can occur as the body tries to compensate for metabolic acidosis, and dehydration can be present, those signs are less specific. Gradual onset is not typical for DKA, which often presents more acutely. So the fruity breath best identifies DKA among the options.