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===Pre-medicationPrevention==={{Main|Prevention of contrast medium reaction}}Before a contrast CT of a patient with known allergic-like or unknown-type of contrast reaction to the same class of contrast medium (such as iodinated), the American College of of Radiology recommends premedication with a glucocorticoid, preferably starting 12 or 13 hours before contrast administration.<ref>{{cite web|url=https://www.acr.org/-/media/ACR/Files/Clinical-Resources/Contrast_Media.pdf#page=11|Page 9 in: Manual on Contrast Media|website=American College of Radiology, Committee on Drugs and Contrast Media|accessdate=2018-08-25}} Version 10.3. 2018. ACR </ref>  Asthma, atopy, and drug or food allergy have been regarded as generally not conferring enough risk to motivate glucocorticiod premedication.<ref>{{cite web|url=https://www.cdha.nshealth.ca/|website=Nova Scotia Department of Health and Wellness|accessdate=2018-08-25|title=Guidelines for contrast media pre-medication}} October 2014</ref>