A client with type 1 diabetes mellitus (DM) is admitted in diabetic ketoacidosis. Treatment is initiated, and the nurse is preparing to administer IV fluids containing potassium chloride. Which assessment data is most important for the nurse to obtain before starting the infusion?

- A) Magnesium level: While magnesium levels can affect cardiac and neuromuscular function, they are not the most critical assessment before potassium infusion. Hypomagnesemia may accompany hypokalemia, but the priority is ensuring renal function to avoid hyperkalemia. - B) Size of the IV catheter: The size of the IV catheter is important for determining the flow rate of the infusion, but it is not the most critical assessment. The catheter size does not directly impact the safety of potassium administration. - C) Potassium chloride administration can cause hyperkalemia if the kidneys are not excreting potassium effectively. Ensuring adequate urinary output before infusion indicates the kidneys are functioning sufficiently to handle the potassium load, making this the most critical assessment. - D) Serum glucose level: Although glucose levels are monitored closely in DKA, they are not the primary concern before administering potassium chloride. The priority here is ensuring the kidneys can excrete potassium effectively, as hyperkalemia can be life-threatening.