Magnetic Resonance Urography (MRU) with Intravenous Contrast
MR urography uses magnetic-resonance images to examine the kidneys, ureters, and bladder. This version includes an intravenous contrast agent.
["This imaging test evaluates the urinary tract and may help identify blockages, stones, or structural abnormalities."]
Key facts at a glance
- LOINC
- 39037-7
- Short code
- MR UE W contr IV
- Synonyms
- MR UE W contr IV
- Category
- liver
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- mr
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
What is this test?
Magnetic resonance urography, or MRU, creates detailed pictures of the kidneys, ureters, and bladder using magnetic fields and radio waves. Intravenous contrast may be given through a vein to improve the visibility of the urinary tract and surrounding structures.
Why might I need this test?
Your clinician may order MRU to investigate blood in the urine, recurrent urinary tract infections, unexplained urinary symptoms, or a suspected blockage. It may also be used to assess kidney stones or the anatomy of the urinary tract when other imaging is not suitable.
How is the test performed?
You will lie on a table inside a magnetic-resonance scanner while images are taken. If contrast is used, it is administered through an intravenous line, and the scan may include images taken before and after the contrast is given.
How do I prepare for the test?
Follow the preparation instructions provided by your imaging center, including any instructions about eating, drinking, or taking medicines. Tell the care team if you are pregnant, have kidney disease, have experienced a prior contrast reaction, or have a pacemaker, implanted medical device, or other metal in your body.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Findings may indicate a kidney or ureteral stone, narrowing or blockage, infection-related changes, or an anatomic abnormality. The images are interpreted together with your symptoms, examination, and other test results by a radiologist and your ordering clinician.
Short name
MR urography with IV contrast
Frequently asked questions
Is magnetic resonance urography the same as a CT scan?
Why is intravenous contrast used?
Can I undergo MR urography if I have kidney disease?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy