A nurse is caring for a client who has recurrent kidney stones and a history of diabetes mellitus. The client is scheduled for an intravenous pyelogram (IVP). The nurse should collect additional data about which of the following statements made by the client?

A. "I haven't had anything to eat or drink since last night.": Fasting is appropriate before an IVP and is expected. B. "I took a laxative yesterday.": A recent laxative may affect bowel prep but is not an absolute contraindication; document and clarify as needed. C. "The last time I voided it was painful.": Pain with voiding is relevant to urinary tract history but does not immediately preclude an IVP. D. "I took my metformin before breakfast.": Metformin given near the time of iodinated contrast increases risk of lactic acidosis; this requires immediate clarification and coordination with the provider about holding the drug.