How do I prepare for a CT urogram?
Before your CT urogram, your healthcare provider will check your vitals (temperature, pulse and blood pressure). They’ll also ask you questions, including:
- Do you have any medical conditions?
- Do you have any allergies to contrast dye or iodine?
- Are you pregnant, or do you think you might be pregnant?
- Are you taking any medications, including medications for diabetes (metformin), non-steroidal anti-inflammatory drugs (NSAIDs), antibiotics or blood-thinning medications (warfarin)?
You may need to take a blood test before your CT urogram. A blood test will ensure your healthcare provider uses the right contrast dye.
If you’re allergic to a contrast dye, you may need to take a steroid medication the night before and the morning of your procedure. You will also likely take an antihistamine before the CT urogram. Your healthcare provider can order these medications for you.
Your healthcare provider will also give you instructions on how to prepare for your CT urogram.
What to expect before a CT urogram
You may have to drink water before your CT urogram and hold your pee until after the test. Drinking water and holding your pee will cause your bladder to expand, making it easier for your healthcare provider to assess.
It’s also a good idea to wear comfortable clothes. You may need to change into a gown before the CT urogram and remove your watch and other jewelry, including piercings. You may need to remove your dentures or hearing aids as well. Metal objects can obstruct the scan.
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What to expect during a CT urogram
During a CT urogram, you will lie on your back on a table (like a bed), though you may also lie on your sides and stomach. Your healthcare provider may ask you to lie on cushions. Cushions help keep your body in the best, most comfortable position during the scan.
A healthcare provider will use a small needle and tube to deliver the contrast dye directly into a vein in your arm or hand (intravenously). It usually isn’t painful, but you will feel a slight pinch as the needle goes through your skin.
As the contrast dye flows through your veins, you may feel warm or flushed, almost like you’re embarrassed. Some people feel nauseous or develop a headache. You may also have a salty or metallic taste in your mouth, and you may suddenly feel like you have to pee. These feelings should go away after a few moments.
When the scan begins, the bed slowly moves into the doughnut-shaped tube. It’s important to stay as still as possible — movement can create blurry images. Let your healthcare provider know if you have to move because you’re uncomfortable or have an itch.
The scanner takes pictures of the areas that your healthcare provider needs to see. The scanner is relatively quiet as it takes pictures. Some people find the process relaxing and may fall asleep.
However, the bed may be slightly noisy as it gradually moves in and out of the scanner while taking images.
How long does a CT urogram last?
Typically, you should plan for an hour for a CT urogram. You and your healthcare providers need time to prepare. The entire session takes between 10 and 30 minutes in order for your body to process the contrast material. Each scan takes between 10 and 30 seconds to complete. You must have several scans to complete the full exam.
What to expect after a CT urogram
Once the scan is complete and your radiologic technologist verifies that the images are clear, they’ll remove the IV from your vein and bandage the area. If you changed into a gown before the scan, you can put your clothes back on.
What are the risks of a CT urogram?
CT urograms are generally safe. However, CT urograms, like other diagnostic imaging procedures, use a small amount of ionizing radiation to capture images. Some risks associated with CT urograms include:
- Cancer risk. All imaging that uses radiation causes a small increase in your risk of developing cancer. The increase is too small to measure effectively.
- Allergic reactions. Occasionally, some people have a minor or more serious allergic reaction to the contrast dye.
- Bruising or angioedema (swelling). Bruising or swelling around the needle injection site may occur.
If you have any concerns about the risks associated with a CT urogram, talk to your healthcare provider. They will listen to your concerns and help you make an informed decision.
