An 80-year-old man with a CFS of 6 has type 2 diabetes controlled on Metformin 500 mg BD. He is due to have a CT scan with intravenous contrast (iodin...

Question

An 80-year-old man with a CFS of 6 has type 2 diabetes controlled on Metformin 500 mg BD. He is due to have a CT scan with intravenous contrast (iodinated contrast medium). His eGFR is 34 mL/min/1.73m². What advice should be given regarding his Metformin?

Accepted Answer

Stop Metformin on the day of the procedure and for 48 hours after, then check renal function before restarting

Answer

Continue Metformin as normal - it does not interact with contrast

Answer

Stop Metformin 1 week before the procedure

Answer

Switch Metformin to insulin permanently before the scan

Answer

Double the Metformin dose before the scan to prevent hypoglycaemia

uk-dgm MCQ (SBA): Metformin and Iodinated Contrast - Renal Precautions

An 80-year-old man with a CFS of 6 has type 2 diabetes controlled on Metformin 500 mg BD. He is due to have a CT scan with intravenous contrast (iodinated contrast medium). His eGFR is 34 mL/min/1.73m². What advice should be given regarding his Metformin?