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CT Angiography with Intravenous Contrast

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

A CT angiogram uses X-rays and intravenous contrast to produce detailed images of blood vessels in the area being examined.

Quick summary

["CTA with IV contrast helps identify narrowing, blockage, leakage, or other abnormalities of blood vessels."]

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

Key facts at a glance

LOINC
42295-6
Short code
CTA UE ves W contr IV
Synonyms
CTA UE 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 angiography, or CTA, is an imaging test that creates detailed pictures of blood vessels. Intravenous contrast is injected into a vein to make the vessels easier to see on the CT images.

Why might I need this test?

CTA may be used to evaluate symptoms such as sudden weakness, chest pain, severe headache, abdominal pain, or limb symptoms. It can also help assess blood vessels before certain procedures or monitor a known vascular condition.

How is the test performed?

You lie on a CT scanner while X-ray images are taken. IV contrast is administered through a vein, usually in the arm, and the scan may include images before and after the contrast is given.

How do I prepare for the test?

Follow the instructions provided by the imaging center. You may need to avoid eating or drinking for several hours, especially if the abdomen or pelvis is being examined. Tell the care team about contrast allergies, kidney disease, pregnancy, or diabetes medicines such as metformin.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CTA with IV contrast

Frequently asked questions

Is CTA the same as a regular CT scan?
No. A regular CT scan may or may not use contrast, while CTA specifically focuses on detailed images of blood vessels.
Does CTA use intravenous contrast?
Yes. Iodinated contrast is given through a vein to help outline the blood vessels during the scan.
How long does a CTA take?
The scan itself is usually brief, although preparation, receiving contrast, and observation afterward can make the overall visit longer.
  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