<prompt> Two most impoant test to be done in a comatose patient with blood glucose of 750mgd1 will be:Serum creatinineSerum sodiumCSF examinationAll  <response>: Answer is A Serum creatinine Presence of blood glucose of 750mgd1 in a comatose patient suggests a possible diagnosis of non ketotic hyperglycemic coma or diabetic ketoacidosis. Amongst the options provided estimation of blood pH will help establish a diagnosis of diabetic ketoacidosis while estimation of serum creatinine will help in establishing a diagnosis of hyperosmolar non ketotic coma as prerenal azotema is a characteristic feature of the latter. 