“How long does CT dye stay in the system?”

The duration for CT contrast dye to stay in the system varies depending on the specific type of dye used, individual factors, and how well your kidneys function. In general, most CT contrast dyes are eliminated from the body within 24-48 hours after the scan.

However, it's important to note that traces of the dye can be detected in urine for a few days following the procedure. It is crucial to stay hydrated by drinking plenty of fluids after th

The contrast dye used in CT scans is typically eliminated from the body within a few hours to a few days. Consult your healthcare team for personalized advice.
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Assuming that your kidney function is normal, with normal hydration, the dye should be out of your system in a day.  

The sources I found suggest that within 24 hours, most contrast has left the body. There are instances where people have multiple tests, making it slower to clear. Healthy functioning kidneys and good hydration help the process work well.
See:
https://theheartandbrain.com/how-long-does-it-take-for-contrast-dye-to-leave-the-body/
People with a history of Chronic Kidney Disease might want to note the
advice from:https://www.kidney.org/atoz/content/Contrast-Dye-and-Kidneys
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