A patient who has type 2 diabetes is being prepared for an elective coronary angiogram. Which information would the nurse anticipate might lead to rescheduling the test?

Rationale: A. The patient took the prescribed metformin today: Metformin should be withheld before contrast dye procedures because it increases the risk of lactic acidosis if renal impairment occurs. This would likely lead to rescheduling the angiogram until the drug is cleared. B. The patient's blood glucose is 128 mg/dL: A glucose level of 128 mg/dL is within an acceptable range for a diabetic patient and would not require postponing the procedure. C. The patient's most recent A1C was 7.5%: An A1C of 7.5% shows moderately controlled diabetes, but it is not an immediate contraindication to proceeding with an angiogram. D. The patient took the prescribed enalapril 4 hours ago: ACE inhibitors such as enalapril are commonly continued unless specifically contraindicated. This does not typically warrant delaying the procedure.