Contrast Guidelines
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Contrast Guidelines

Please be assured these are recommendations only. If you would like to speak to one of our radiologists for the best contrast guidelines for your patient, please call us directly.

The ACR recommends that patients taking Metformin be classified into one of two categories based on the patient’s renal function (as measured by GFR).

1. Based on the ACR recommendations, patients who are taking Metformin and are not renal compromised, i.e., with normal creatinine level, can safely take their Metformin without any restriction before or after the contrast injection.

2. In patients taking Metformin who are known to have acute kidney injury or severe chronic kidney disease (stage IV or stage V), the contrast will not be administered unless the patient is scheduled for dialysis the next day or within 24 hours. In that case, the Metformin should be temporarily discontinued at the time of the procedure, and be withheld for 48 hours subsequent to the procedure and reinstituted thereafter.

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