Elevated glucose
May check:
CBC
Chemistry (gap)
Ketones
CBC
Chemistry (gap)
Ketones
Nonketotic hyperglycemia
Physiologic stress response 
Starvation ketoacidosis
Diabetes mellitus 
Hyperosmolar hyperglycemic state
Hypoglycemia
Hyperosmolar hyperglycemic state 
Metformin-associated lactic acidosis