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CT Angiography of the Renal Vessels — With and Without Intravenous Contrast

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

A CT scan uses injected iodinated contrast to examine the blood vessels supplying the kidneys and may include images before and after contrast.

Quick summary

["This test helps evaluate the renal arteries and veins for narrowing, blockage, or other vascular abnormalities."]

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

Key facts at a glance

LOINC
87846-2
Short code
CTA Renal ves WO+W contr IV
Synonyms
CTA Renal ves WO+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?

Renal vessel CT angiography is an imaging test that uses a CT scanner and an intravenous iodinated contrast agent to show the blood vessels that supply and drain the kidneys. Images may be obtained before and after contrast is injected.

Why might I need this test?

This test may be ordered to evaluate suspected renal artery narrowing, blood clots, aneurysms, or other problems affecting blood flow to the kidneys. It may also be used to plan certain procedures or monitor known vascular conditions.

How is the test performed?

You lie on a CT table while an IV line is placed and contrast is injected, usually into a vein in the arm. The scanner rapidly takes multiple pictures, and the images are reviewed by a radiologist.

How do I prepare for the test?

Follow the imaging center's instructions, especially any fasting or medication guidance. Tell the care team if you have kidney disease, have had a serious reaction to iodinated contrast, or may be pregnant, because these factors may affect the test and its preparation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Renal Vessel CT Angiography

Frequently asked questions

Is this the same as a routine abdominal CT?
No. CT angiography is specifically timed to highlight blood vessels and generally requires IV iodinated contrast.
Will I need an IV line?
Yes. Contrast is typically injected through a vein in the arm or, when appropriate, through a larger central vein.
Can this test be performed if I have kidney disease?
It may still be possible, but kidney function and the reason for the scan must be reviewed. The care team may use special precautions or choose an alternative imaging method if contrast poses a significant risk.
  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