A contrast allergy note on the chart can trigger delays, unnecessary steroids and avoided scans, yet often these labels are not clinically justified. A new practice article in CMAJ, “Hypersensitivity reactions to iodinated contrast media,” examines how the labels arise and why the standard premedication rests on contrast agents that are no longer used. Dr. Samira Jeimy, an associate professor and program director of the division of clinical immunology and allergy at Western University and an ...