A nurse accidently administers metformin instead of metoprolol to a client. Which of the following actions should the nurse take?

A. HDL level is not directly relevant to the error of administering metformin instead of metoprolol. B. Uric acid level is not a priority following this medication error. C. Checking the client's glucose level is the priority because metformin is used to treat type 2 diabetes, and its administration could lead to hypoglycemia if the client was not already on a diabetic regimen. D. Monitoring thyroid function is not relevant to this error.