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CT Angiography, Abdomen, Aorta, and Bilateral Lower-Extremity Runoff Vessels, With or Without IV Contrast

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

This CT angiography uses X-rays and IV contrast to examine blood vessels in the abdomen, aorta, and both lower legs.

Quick summary

["The test helps radiologists assess major blood vessels for narrowing, blockage, aneurysms, or other abnormalities."]

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

Key facts at a glance

LOINC
78031-2
Short code
CTA Abd Aorta+ROves-Bl WO+WcontrIV
Synonyms
CTA Abd Aorta+ROves-Bl WO+WcontrIV
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?

This is an imaging test, not a blood test. CT angiography uses X-rays to create detailed pictures of blood vessels, including the abdominal aorta and vessels supplying both lower legs. Images may be taken before and after IV contrast is given.

Why might I need this test?

It may be ordered to evaluate suspected narrowing, blockage, aneurysm, dissection, bleeding, or inadequate blood flow. It may also help plan surgery, catheter-based procedures, or other vascular treatment.

How is the test performed?

You lie on a CT scanner while the machine takes X-ray images. An IV line may be used to inject iodinated contrast, followed by additional images as the contrast moves through the vessels.

How do I prepare for the test?

Follow the imaging center's instructions; fasting is commonly required for abdominal CT angiography. Tell the care team about contrast allergy, kidney disease, pregnancy, metformin use, or other relevant medical conditions before the appointment.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal findings may indicate arterial narrowing, blockage, aneurysm, dissection, bleeding, or an abnormal pattern of blood flow. The radiologist interprets the images in the context of symptoms and other tests. This test does not provide the same type of numeric results as a laboratory blood test.

Short name

Abdominal and Lower-Extremity CT Angiography

Frequently asked questions

Does this test use radiation?
Yes. CT angiography uses X-ray radiation, and IV contrast may also be administered.
Why are images taken before and after contrast?
Pre-contrast images provide a baseline, while post-contrast images show the blood vessels more clearly and can reveal abnormalities that are not visible without contrast.
Is this the same as catheter angiography?
No. CT angiography is generally noninvasive and is performed from outside the body, while catheter angiography involves inserting a thin tube into a blood vessel.
  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