A CT urogram with contrast is a specialized CT scan using intravenous iodinated contrast to image the kidneys, ureters and bladder. Multiphase images (including non-contrast and delayed excretory phases) highlight stones, tumors, strictures and causes of hematuria or obstruction. It assesses urinary tract anatomy and function; you may need blood tests to check kidney function and for contrast allergy beforehand.

CT urography is generally not painful. The scan itself is painless, though you may feel brief discomfort from IV cannulation and a warm flushing sensation when contrast is injected. Some people experience mild nausea, metallic taste, or local stinging if contrast leaks. Lying still, breath‑holding and a full bladder may cause temporary discomfort; serious pain or allergic reactions are rare.

A CT scan with contrast for kidneys is an X‑ray–based imaging test where iodinated dye is injected intravenously to better show the kidneys, ureters and surrounding blood vessels. It helps detect stones, tumors, infections, trauma, obstruction and vascular problems. Preparation often includes blood tests for kidney function and hydration; risks include allergic reaction and possible contrast-related kidney injury, so clinicians review meds and pregnancy status.

CT urography is generally safe for people with normal kidney function, but iodinated contrast can cause contrast-associated acute kidney injury in those with reduced eGFR, diabetes, dehydration, heart failure, or on nephrotoxic drugs. Renal function is checked beforehand; IV/oral hydration, using the lowest contrast dose or alternative imaging (MR urography/ultrasound), and temporarily stopping certain medications reduce risk.

Your doctor likely ordered a CT urogram to get detailed images of your kidneys, ureters and bladder using contrast. It’s used to investigate blood in the urine, flank pain, suspected stones, obstruction, urinary leaks, or tumors, and to evaluate congenital abnormalities. The test helps pinpoint the cause of symptoms and guides treatment or further testing.

After a CT scan with iodinated contrast, drink plenty of fluids to help flush the dye — typically an extra 1–2 liters (about 4–8 glasses) over the next 24 hours. Continue good hydration for 24–48 hours. If you have kidney disease, heart failure, or fluid restrictions, follow your clinician’s instructions. Contact your provider if you have very little urine, swelling, or breathlessness.