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CT Renal Angiography with Intravenous Contrast

Published: August 9, 2026Updated: August 16, 2026

A CT scan uses intravenous contrast and imaging to examine the arteries supplying the kidneys and assess kidney-related blood flow.

Quick summary

["This test helps evaluate the renal arteries and blood supply to the kidneys, including the effects of narrowing or blockage."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
36833-2
Short code
CTA Renal ves W contr IV
Synonyms
CTA Renal ves 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
ct-angio
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?

CT renal angiography is an imaging test that uses computed tomography and intravenous contrast to show the blood vessels that supply the kidneys. It can help identify narrowing, blockage, aneurysms, or other abnormalities affecting renal blood flow.

Why might I need this test?

Your clinician may order this test to investigate high blood pressure, reduced kidney function, suspected renal artery disease, or symptoms such as sudden abdominal or flank pain. It may also be used before certain procedures or when other kidney imaging is inconclusive.

How is the test performed?

You lie on a CT table while the scanner takes images from different angles. Intravenous contrast is given through a vein in your arm, and the scan is performed quickly, usually with little downtime afterward.

How do I prepare for the test?

Your care team will provide specific instructions. You may need to avoid eating or drinking for a period beforehand and may need to discuss kidney function, previous contrast reactions, allergies, pregnancy, medications, or conditions affecting the kidneys.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CT renal angiography

Frequently asked questions

Is this the same as a routine kidney CT scan?
No. CT renal angiography is specifically designed to emphasize the blood vessels supplying the kidneys and typically involves intravenous contrast.
Is the contrast material safe if I have a kidney condition?
Contrast can be used carefully, but your clinician should review kidney function and other risk factors before the procedure. Tell the imaging team about any previous contrast reaction or kidney disease.
Does this test require a hospital stay?
Usually not. The scan is generally performed as an outpatient procedure, and most people can return to normal activities afterward unless your clinician gives different instructions.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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