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Computed Tomography (CT) Scan with Intravenous Contrast

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

A CT scan uses X-rays and computer images to examine internal structures. Intravenous contrast may improve the visibility of blood vessels and tissues.

Quick summary

["This test uses X-ray imaging and may include an IV injection of contrast to produce detailed images."]

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

Key facts at a glance

LOINC
86964-4
Short code
CTA LE ves-L W contr IV
Synonyms
CTA LE 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?

A CT scan creates detailed cross-sectional images of the body using X-rays. Intravenous contrast is a material injected into a vein to help certain tissues and blood vessels appear more clearly on the images.

Why might I need this test?

CT imaging may be used to evaluate injury, infection, bleeding, blockage, tumors, or problems involving organs and blood vessels. Your clinician will explain which body area is being examined and what condition the scan is intended to assess.

How is the test performed?

You will usually lie on a table that moves through the CT scanner while X-ray images are taken. If contrast is required, it is given through an IV in your arm; you may feel warmth, flushing, or a brief sensation of urination, and the IV may cause mild discomfort.

How do I prepare for the test?

Follow the instructions provided for your specific scan, which may include avoiding food or drinks for several hours. Tell the imaging team about contrast allergies, kidney disease, pregnancy or possible pregnancy, and medications or implanted medical devices before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CT scan with IV contrast

Frequently asked questions

Is a CT scan with contrast safe?
CT scans are generally safe when the correct safety measures are followed. Contrast reactions are uncommon, but kidney function, prior contrast reactions, allergies, pregnancy, and other conditions may affect the preparation or use of contrast.
Will I feel the contrast being injected?
The IV injection may feel like a brief pinch. Some people experience warmth, flushing, nausea, or a strong urge to urinate, but these sensations usually pass quickly.
How soon will I receive the results?
A radiologist will review the images and send a report to your ordering clinician. The time available for results varies, so ask the imaging center when you may expect to hear them.
  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