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CT Scan of the Skull Base Without Contrast

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

A CT scan creates detailed images of the bones and soft tissues at the base of the skull without using injected contrast dye.

Quick summary

["This imaging test evaluates the skull base for fractures, bone abnormalities, tumors, and other structural changes."]

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

Key facts at a glance

LOINC
44112-1
Short code
CT Skull.base WO contr
Synonyms
CT Skull.base WO contr
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 skull base CT scan uses X-rays and a computer to create cross-sectional images of the area at the bottom of the skull. It is performed without injected contrast dye.

Why might I need this test?

Your clinician may order this test to evaluate head or facial trauma, persistent symptoms such as headache or vision changes, or suspected infection, bone disease, or a mass. It can also help assess the skull base and nearby structures before or during other medical procedures.

How is the test performed?

You will lie on a padded table while a CT scanner moves around your head. The scan is generally painless and usually takes only a few minutes, although you may be asked to remain still or hold your breath briefly.

How do I prepare for the test?

No special preparation is usually required for a scan without contrast. Remove metal objects, remove hearing aids if requested, and tell the imaging team if you are pregnant, may be pregnant, or have a condition that affects the scan.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Skull base CT without contrast

Frequently asked questions

Does this test use contrast dye?
No. The phrase “without contrast” means that no contrast material is injected through a vein for this scan.
Is a skull base CT scan the same as a routine head CT?
A skull base CT focuses more closely on the bones and tissues at the base of the skull, while a routine head CT may cover a broader area of the brain and skull.
Will I be able to drive after the test?
Most people can leave and drive normally because no sedation is used. If you received sedation for another reason or your clinician restricts activity, follow their instructions.
  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