Helical Computed Tomography (CT) with Intravenous Contrast
A CT scan uses X-rays and intravenous contrast to create detailed cross-sectional images and help identify abnormalities in the body.
["This CT scan combines X-ray imaging with a bloodstream dye to provide more detailed pictures of internal organs and tissues."]
Key facts at a glance
- LOINC
- 36198-0
- Short code
- Deprecated Heel CT W contr IV
- Synonyms
- Deprecated Heel CT 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
- 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 helical CT scan rapidly rotates an X-ray source around the body to create detailed cross-sectional images. Intravenous contrast, also called contrast dye, is injected into a vein to help certain tissues and blood vessels appear more clearly.
Why might I need this test?
CT with IV contrast may be used to evaluate unexplained symptoms, investigate an injury or mass, look for infection or inflammation, and help plan or monitor treatment. The exact reason depends on the body area being imaged and the clinical situation.
How is the test performed?
You lie on a motorized table while the scanner rotates around you. An IV line is placed in a vein, contrast is injected, and multiple X-ray images are taken. The scan usually takes less time than a conventional CT scan.
How do I prepare for the test?
Follow the instructions provided by the imaging center, including any fasting or medication guidance. Tell the care team about prior contrast reactions, kidney disease, severe allergies, pregnancy, and all current medicines so they can determine whether special precautions are needed.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal findings may represent an injury, infection, inflammation, bleeding, a blockage, a cyst, or a tumor, depending on the area scanned. The radiologist interprets the images in the context of your symptoms and other test results. The scan is generally safe, but IV contrast can occasionally cause an allergic-like reaction or affect kidney function.
Short name
CT with IV contrast
Frequently asked questions
Does a CT scan with IV contrast use radiation?
Is IV contrast the same as the drink used for some CT scans?
Will I need someone to drive me home?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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