CT urography shows the kidneys, ureters and bladder in detail and is used for blood in urine, tumours and blockages. Learn how it differs from CT KUB.
CT urography is a contrast CT scan that examines the kidneys, ureters and bladder in several phases. It is used for blood in urine (hematuria), suspected tumours, strictures, congenital anomalies and complex stone disease, and gives much more detail than a plain CT KUB.
What Is CT Urography?
After contrast injection, the dye first fills blood vessels, then the kidney tissue, and finally the urine collecting system. Images taken at each phase show different problems. The delayed phase outlines the ureters and bladder from inside. See CT KUB for kidney stones for the simpler test.
FeatureCT KUBCT urographyContrastNoYes, in phasesBest forStonesTumours, blockages, anatomyPhasesSinglePlain, contrast and delayed (excretory)RadiationLowModerateKidney check neededNoYesWhen Is CT Urography Advised?
- Blood in urine, especially painless
- Suspected kidney, ureter or bladder tumours
- Recurrent infection with suspected structural problem
- Blockage or narrowing of the ureter
- Congenital problems such as double ureter
- Follow-up after urinary tract cancer treatment
Preparation
- Fast for 4 to 6 hours.
- Drink water before the scan, as advised, since good hydration improves images.
- Carry a recent creatinine report.
- Tell the staff about allergy, diabetes, kidney disease or pregnancy.
See CT scan preparation and CT with contrast.
What Happens During the Scan?
You lie on the table, and the first scan is done. Contrast is then injected, and the next scan follows. You may be asked to wait 10 to 15 minutes, or even walk around, before the final delayed scan. Sometimes saline is given to improve filling. The total time is about 30 to 45 minutes. See CT scan procedure.
Alternatives
MR urography is a radiation-free option for people who cannot have iodine contrast or radiation, such as some young patients and pregnant women. Ultrasound and cystoscopy also play roles. Your urologist chooses based on your case. See MRI pelvis scan.
A Practical Example
Rashid, 60, a smoker, notices blood in urine without pain. His ultrasound is normal. A CT urography shows a small growth in the bladder and a normal upper tract. A cystoscopy confirms the tumour, which is removed early. A single scan guided the exact next step.
Quick Summary
- CT urography shows the whole urinary tract with contrast
- It is the preferred scan for blood in urine
- Kidney function and allergy history must be checked
- MR urography is an alternative in selected people
Questions to Ask Your Doctor
- Is CT urography or MR urography better for me?
- Is my kidney function suitable for contrast?
- What is the next step if a growth is seen?
- Should I also do a cystoscopy?
Common Mistakes to Avoid
- Not drinking water before the scan.
- Skipping the creatinine report.
- Leaving between phases of the scan.
Booking, Timing and Report
Most CT scans can be booked on the same day, and the visit takes 20 to 40 minutes. Carry your prescription, old scans and a recent creatinine report if contrast is planned. Reports are usually ready within 24 hours, and images can be provided on a CD or digital link for your doctor.
After the Scan and Next Steps
Drink water after the scan, and report rash, swelling or reduced urine to your doctor. Your urologist will review the CT urography together with a urine test and cystoscopy where needed. If a growth is suspected, a biopsy is usually needed to confirm. Many findings turn out to be non-cancerous, such as stones, infection or narrowing, so do not panic before the full evaluation.
Key Facts at a Glance
- CT urography uses contrast in several phases
- It is the preferred scan for blood in urine
- Hydration helps the images
Frequently Asked Questions
What is CT urography used for?
To examine the kidneys, ureters and bladder for tumours, blockages and stones.
Is CT urography the same as CT KUB?
No. CT urography uses contrast and several phases.
Do I need fasting?
Yes, 4 to 6 hours.
Is it safe for kidney patients?
Needs a doctor's decision, since contrast stresses weak kidneys.
How long does it take?
Around 30 to 45 minutes.
Why is waiting needed in the middle?
To allow contrast to fill the ureters and bladder.
Is it painful?
No, apart from the needle prick.
Can I have it in pregnancy?
Usually avoided; MR urography may be used.
When is the report ready?
Usually within 24 hours.
Book Your Test at Ganesh Diagnostic
Ganesh Diagnostic & Imaging Centre in Rohini, Delhi offers this test with trained radiology staff and clear reports. You can book an appointment online, check our branches across Delhi NCR, contact us for current rates, or explore all our services. Reports can be downloaded online through our patient portal, so you do not need to make a second trip just to collect them.
This article is for general information only. It does not replace advice from your doctor. Always follow your doctor's instructions for your test.
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