Contrast Dye and Kidney Risk
What contrast dye used in scans can do to the kidneys, and who is at risk.
Last updated: 2026-09-24
Contrast dye used in some CT scans and angiograms can stress the kidneys, especially in people with existing kidney disease.
Who is at risk
People with reduced kidney function, diabetes or dehydration are at higher risk. Tell the radiology team about any kidney condition.
Frequently asked questions
Should I avoid CT scans with contrast?
Not necessarily — but your kidney function should be checked first, and hydration is often advised.