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Computed Tomography Angiography with Intravenous Contrast

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

CT angiography uses injected contrast and imaging to show blood vessels and may be used to evaluate narrowing, blockage, leakage, or aneurysms.

Quick summary

["This imaging test helps identify and assess abnormalities in the blood vessels being examined."]

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

Key facts at a glance

LOINC
86961-0
Short code
CTA UE ves-L W contr IV
Synonyms
CTA UE ves-L 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 uses X-rays and intravenous contrast to produce detailed pictures of blood vessels. The exact areas examined are determined by the imaging order.

Why might I need this test?

Your clinician may order CTA to investigate symptoms such as pain, swelling, weakness, numbness, or reduced circulation. It may also be used to evaluate a suspected aneurysm, blood clot, vessel narrowing, or bleeding.

How is the test performed?

An intravenous line is placed, contrast is injected, and X-ray images are taken while you lie on the CT scanner. The scan usually takes only a short time, although the total visit may be longer.

How do I prepare for the test?

Follow your clinician's instructions, especially if kidney disease, diabetes, pregnancy, or a previous contrast reaction is possible. Tell the imaging team about contrast allergies, medications, and any recent contrast-enhanced scan.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CT Angiography

Frequently asked questions

Is CT angiography the same as a routine CT scan?
No. CTA specifically highlights blood vessels using intravenous contrast, while a routine CT scan may focus on organs, bones, or other tissues.
Is intravenous contrast safe?
Contrast is generally safe, but some people experience warmth, nausea, or a metallic taste. Tell the imaging team about prior contrast reactions, allergies, or kidney disease before the procedure.
Does this test treat the condition it finds?
No. CTA is primarily a diagnostic test. Your clinician may recommend medication, monitoring, or another procedure after reviewing the results.
  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