Diabetes mellitus

A 38-year-old male is brought to the emergency department by his friend after nausea, profuse vomiting, and frequent urination over the past 24 hours. He is stuporous and weak with deep, labored breathing. His friend says he was on a long hike when he began to feel very fatigued and his symptoms started. The patient’s medical history includes diabetes mellitus type 1. Physical examination shows pallor, dry mucous membranes, diaphoresis and tachycardia. Laboratory studies are pending. Which of the following is the most significant whole-body electrolyte status in this patient's condition?