A client with diabetic ketoacidosis was admitted to the intensive care unit 4 hours ago and has these laboratory results: blood glucose level 450 mg/dl, serum potassium level 2.5 meq/l, serum sodium level 140 meq/l, and urine specific gravity 1.025. the client has two i.v. lines in place with normal saline solution infusing through both. over the past 4 hours, his total urine output has been 50 ml. which physician order should the nurse question