A 6-year- old came to the ER complaining of lethargy, nausea…

A 6-year- old came to the ER complaining of lethargy, nausea, and vomiting for 3-4 days. The mother said the child was urinating frequently, thirsty all the time, and eating a lot. The patient’s laboratory work showed: WBC – 12,500/μL HGB – 11.2 g/dL Serum Acetone – large Glucose – 800 mg/dL pH – 7.2 pO2 – 120 mmHg pCO2 – 20.1 mmHg HCO3 – 12 mmoI/L Base excess – 14.7 What is his patient’s likely diagnosis?