Which sign is most characteristic of diabetic ketoacidosis?

• A. Hypoventilation
• B. Normal Blood Glucose
• C. Cold, Clammy Skin
• D. Fruity Odor On Breath

Answer: (D)

In diabetic ketoacidosis, the body breaks down fats for energy due to insufficient insulin, producing ketones and causing a metabolic acidosis. One ketone, acetone, is volatile and can be exhaled, giving a fruity odor to the breath. This smell is a distinctive clue that points toward DKA, making it the best sign to identify this condition.

Other options don’t fit as well. Hypoventilation would indicate high CO2 retention, not the deep, rapid breathing you usually see in DKA (often described as Kussmaul respiration, a compensatory response to acidosis). Normal blood glucose is unlikely in DKA, where glucose is typically elevated, often well above normal levels. Cold, clammy skin is more typical of hypoglycemia, while DKA patients usually appear dehydrated and may have warm, dry skin due to fluid loss.