Skip to content

CT Scan of the Temporal Bones Without Contrast

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

A CT scan uses X-rays to create detailed images of the temporal bones, including the structures of the ears and nearby skull.

Quick summary

["This scan provides detailed images of the ear bones and surrounding skull without using IV contrast."]

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

Key facts at a glance

LOINC
36867-0
Short code
CT Temporal bone-L WO contr
Synonyms
CT Temporal bone-L 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 temporal bone CT scan is a specialized X-ray exam that creates detailed images of the skull bones surrounding the ears. It can help evaluate the middle ear, inner ear, auditory nerve canal, and nearby bony structures.

Why might I need this test?

This test may be ordered to investigate hearing loss, ear pain, drainage, dizziness, or a suspected fracture. It can also assess bony abnormalities, infections, tumors, or the anatomy needed for ear surgery and cochlear implant planning.

How is the test performed?

You will lie on a padded table while a CT scanner rotates around your head and takes X-ray images. The exam is painless, but you must remain still, and the scanner may make loud clicking or buzzing sounds.

How do I prepare for the test?

Usually no fasting or medication changes are required. Remove jewelry, hairpins, and other metal objects near your head, and tell the imaging team if you may be pregnant or have had a similar scan before so prior images can be compared.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

The scan may identify fractures, bone erosion, fluid-related changes, narrowing of ear passages, or abnormal growths involving the temporal bone. Findings are interpreted together with your symptoms, physical examination, hearing tests, and other imaging, because some abnormalities can have more than one cause.

Short name

Temporal Bone CT Without Contrast

Frequently asked questions

Does this CT scan use contrast dye?
No. The specified test is performed without IV contrast, so you generally will not need an injection or a contrast-related waiting period.
Is a temporal bone CT scan the same as a routine head CT?
No. It is a focused, detailed study of the temporal bones and ear structures, often using thin image slices that are especially useful for evaluating small bony anatomy.
Can I have this scan if I am pregnant?
Tell the imaging team before the exam. Although this test does not use contrast, the technologist will review the risks and may recommend postponing the scan if clinically appropriate.
  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