Imaging
CT scan: what does "without contrast" mean?
What is the short answer?
No dye is used.
It's often the test of choice for kidney stones, since stones show clearly without dye.
When should I make an appointment?
Get checked if you have sudden side pain that could be a kidney stone.
What happens at a visit?
Our two Gwinnett offices each include a surgery center: Snellville at 1557 Janmar Rd, Snellville, GA 30078 and Lawrenceville at 501 Crown Pointe Way, Lawrenceville, GA 30046. Let us know which part of the county you call home, and we’ll take it from there.
How do our urologists approach this?
When stones are suspected, our urologists often prefer a CT scan without dye, because stones show up clearly and the scan is quick. If we need a closer look at the kidney or bladder lining, we may order a scan with contrast instead. Either way, we explain why we picked that test and what the results mean for your care.
What happens at a visit?
Tell us about kidney problems, diabetes medicines or past reactions to dye before any scan. If you’ve already had a CT, bring the report or disc so we can avoid repeating it. Then we’ll go over the images and the plan with you.
How should I prepare?
Bring earlier scan reports. Mention any dye allergies.
When should I call?
Call us if you have sudden side pain that comes in waves, can’t keep fluids down, or haven’t heard about your scan results. With fever, go to the ER.
What do patients often ask?
These are the questions we hear most, each with a short answer.
Why not always use contrast?
For stones, dye isn’t needed, because stones show clearly without it, and skipping it keeps the scan simple.
Will I need another scan later?
Sometimes a follow-up scan shows whether a stone has moved or passed. We’ll tell you if that’s part of your plan.
Is there a video on this?
If your CT shows a stone, this video explains ureteroscopy, a common way to treat it.
- Watch: Kidney Stones and Ureteroscopy - Everything you need to know What the video covers: An explainer on kidney stones and ureteroscopy.
What should I read next?
Educational content; your own care plan comes from a visit. Back to the reading room