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CT Orbit Without Intravenous Contrast

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

A CT scan of the eye sockets that uses X-rays without injected contrast, commonly used to evaluate injury, swelling, masses, and bone changes.

Quick summary

["This scan creates detailed images of the eye sockets and nearby structures without using injected contrast."]

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

Key facts at a glance

LOINC
46331-5
Short code
CT Orbit WO contr
Synonyms
CT Orbit 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 CT orbit scan uses X-rays and computer technology to create detailed images of the eye sockets, eyeballs, optic nerves, and surrounding bones. This version is performed without intravenous contrast dye.

Why might I need this test?

Your clinician may order this scan to assess eye or facial injuries, unexplained swelling, inflammation, infection, or a suspected mass. It can also show fractures and changes in the bones around the eyes.

How is the test performed?

You will lie on a table while an X-ray machine rotates around your head. The scan is usually brief, and you may be asked to keep your eyes closed or remain still. No injected dye is needed for this examination.

How do I prepare for the test?

Fasting is generally not required, but follow any instructions provided by the imaging center. Remove glasses, jewelry, hair accessories, and other metal near the scan area, and tell the technologist if you are pregnant or may be pregnant.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal findings may indicate a fracture, swelling, inflammation, infection, a mass, or another condition affecting the orbit or nearby bones. Your clinician will interpret the images together with your symptoms, examination, and other test results. A normal scan does not rule out every eye or nerve problem.

Short name

CT orbit without contrast

Frequently asked questions

Does this CT scan use contrast dye?
No. “Without contrast” means no intravenous contrast dye is injected, although you may receive oral contrast in some situations if your clinician specifically orders it.
Is the CT orbit scan painful?
The scan itself is not painful. You may be asked to hold very still, and the enclosed scanner can feel restrictive, but it does not typically cause pain.
How much radiation does the scan involve?
A CT scan uses ionizing radiation, but the dose is set to obtain the needed images. The imaging center can provide information about the scan and your specific examination.
  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