CT Scan of the Neck and Mediastinum — With and Without IV Contrast
A CT scan uses X-rays to create detailed images of the neck and chest area called the mediastinum, with images taken before and after IV contrast.
["This CT scan evaluates structures in the neck and mediastinum and may help identify masses, inflammation, infection, or other abnormalities."]
Key facts at a glance
- LOINC
- 83308-7
- Short code
- CT Neck+Mediastinum.sup WO contr
- Synonyms
- CT Neck+Mediastinum.sup WO contr
- Category
- liver
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 10
- Ref high
- 40
- Critical range
- — – 10000 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ct
- CPT
- 84484
- SNOMED
- 302774002
- 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 a CT, or computed tomography, scan of the neck and mediastinum, the central area of the chest between the lungs. Images are obtained before and after an intravenous contrast agent is given.
Why might I need this test?
The scan may be ordered to investigate a lump, swelling, pain, breathing difficulty, or unexplained symptoms. It can help evaluate lymph nodes, thyroid and nearby structures, blood vessels, and abnormalities in the mediastinum.
How is the test performed?
You lie on a table while a CT scanner rotates around you and takes X-ray images. IV contrast is usually injected through a vein, and the scan may include images before contrast and shortly afterward.
How do I prepare for the test?
Follow the instructions provided by the imaging center, including whether to avoid eating or drinking beforehand. Tell the care team about kidney disease, previous contrast reactions, iodine allergy, and pregnancy or possibility of pregnancy.
Reference range
Adult: 10-40 U/LN/A
No special preparation required. Avoid fatty meals before the test if possible.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal findings may include enlarged lymph nodes, a mass, inflammation, fluid collection, infection, or narrowing of an airway or blood vessel. The scan can also help characterize changes in organs and blood vessels in the mediastinum. Results must be interpreted by a radiologist in the context of symptoms and other clinical information.
Short name
CT Neck and Mediastinum
Frequently asked questions
Does this test use radiation?
What is IV contrast, and why is it used?
Will I need blood tests before the scan?
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 17, 2026. · Read our editorial policy