A patient in the emergency department presents with Kussmaul…

A patient in the emergency department presents with Kussmaul breathing, very thirsty and frequent urination. The following arterial blood gas has been analyzed:   pH – 7.17 PaCO2 – 30 mmHg PaO2 – 95 mmHg HCO3 – 15 mEq/L   What else should be assessed at this time to rule out this patients problem?