Final answer:
In the context of a CT scan with iodine contrast, a patient on metformin who has diabetes mellitus should have their medication managed according to the hospital's protocol.
Step-by-step explanation:
If a patient scheduled for a CT scan with an intravenous iodine contrast dye has diabetes mellitus and is taking metformin, it is important for the nurse to be aware of the potential risks. In patients with diabetes who are on metformin, the use of iodine contrast can increase the risk of lactic acidosis, a serious condition. Since metformin can be affected by the kidney function changes induced by contrast dyes, guidelines often recommend that patients stop taking metformin before receiving contrast agents.
The nurse should check the hospital's protocol, which usually includes holding metformin before and after the procedure for a specified period and monitoring kidney function. The decision to stop metformin is typically based on factors such as the patient's renal function and the type and amount of contrast dye being used.
Prior to conducting any glucose tolerance tests (GTT) or insulin tolerance tests (ITT), patients should generally be stabilized, and diabetes management should be adjusted accordingly to prevent complications during procedures that require contrast dye or any other interventions.