A nurse is assessing a patient with type 1 diabetes mellitus who was brought to the emergency department. Which assessment finding would be the priority concern indicating diabetic ketoacidosis?

The fruity odor on breath (acetone breath) combined with deep, rapid respirations (Kussmaul respirations) are classic signs of diabetic ketoacidosis and indicate severe metabolic acidosis requiring immediate intervention.

Diabetic ketoacidosis (DKA) is a life-threatening acute complication of diabetes that requires immediate recognition and intervention. This condition occurs when insulin is deficient and is characterized by hyperglycemia, ketosis, and metabolic acidosis.

The priority assessment finding indicating DKA is a fruity odor on the breath along with deep, rapid breathing (Kussmaul respirations). The fruity or acetone odor is caused by the presence of ketones, particularly acetone, which are volatile compounds produced during fat metabolism when glucose cannot be used effectively. Kussmaul respirations represent the body's compensatory mechanism to eliminate excess carbon dioxide and reduce acidosis through respiratory alkalosis.

The pathophysiology of DKA involves three main components: hyperglycemia (usually >250 mg/dL), ketosis, and metabolic acidosis (pH

Understanding the Priority in DKA Assessment

When a patient with type 1 diabetes mellitus presents with missed insulin doses and gastrointestinal symptoms, the nurse must rapidly identify findings that signal a life-threatening emergency. Diabetic ketoacidosis (DKA) is the most frequent hyperglycemic emergency and a leading cause of death in this population ^[1]. The priority concern is always the assessment finding that indicates a failure of physiological compensation and an immediate threat to the airway or breathing. In DKA, this is the combination of a fruity odor on breath and Kussmaul respirations (deep, rapid respirations).

Pathophysiology of the Priority Finding
The biochemical triad of DKA includes hyperglycemia, ketonemia, and acidemia ^[3]. A lack of insulin forces the body to break down free fatty acids for energy, producing acidic ketone bodies. As metabolic acidosis worsens, the respiratory system initiates a compensatory mechanism to blow off carbon dioxide (CO2) and raise the blood pH. This manifests clinically as deep, rapid breathing. The fruity odor on the breath is a direct consequence of exhaled acetone, a type of ketone body. This finding is a critical and late sign of severe acid-base disturbance, making it the highest priority because it directly reflects a failing compensatory mechanism that can lead to respiratory failure if not immediately treated.

Analysis of the Options

* Option 1: Blood glucose level of 180 mg/dL
While DKA involves hyperglycemia, a value of 180 mg/dL is only mildly elevated and not specific to DKA. DKA can sometimes present with euglycemia. The core problem is not the glucose level itself but the production of ketones and resulting acidosis ^[1]. This finding is not the priority.

* Option 2: Mild dehydration with decreased skin turgor
Dehydration is a common clinical symptom of DKA, resulting from osmotic diuresis driven by hyperglycemia ^[3]. However, "mild" dehydration indicates a fluid volume deficit that, while requiring treatment, does not pose the same immediate threat to airway, breathing, and circulation as an uncompensated acidotic state. It is a secondary concern to respiratory status.

* Option 3: Complaint of increased urination and thirst
Polyuria and polydipsia are classic, early symptoms of hyperglycemia and precede the development of full-blown DKA ^[3]. The patient’s 2-day history of nausea and vomiting indicates a progression beyond this initial stage. This finding reflects the precipitating osmotic diuresis but is not the most critical indicator of the current, acute emergency.

* Option 4: Fruity odor on breath with deep, rapid respirations
This is the correct answer. The fruity odor is a sign of significant ketone body accumulation, and the deep, rapid respirations (Kussmaul breathing) are a direct compensatory response to severe metabolic acidosis. This finding signals that the body's buffer systems are overwhelmed and the patient is at high risk for clinical deterioration, including altered consciousness and respiratory failure ^[3]. DKA is always lethal if misdiagnosed or improperly treated, and recognizing this respiratory pattern is key to prompt diagnosis and life-saving intervention ^[1].