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CT Scan of the Temporal Bone Without Contrast

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

A CT scan creates detailed images of the temporal bones of the skull, including the ear canals, middle and inner ear, and nearby bony structures.

Quick summary

["This scan evaluates the bony anatomy of the ear and nearby skull structures without using iodinated contrast."]

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

Key facts at a glance

LOINC
36866-2
Short code
CT Temporal bone WO contr
Synonyms
CT Temporal bone 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 uses X-rays and a computer to produce detailed images of the bones that make up the ear and the surrounding base of the skull. It can assess the ear canal, middle-ear and inner-ear structures, and nearby bone.

Why might I need this test?

This scan may be recommended for hearing loss, ear pain, drainage, trauma, suspected infection, or a bony growth or other structural abnormality. It is also used to evaluate the anatomy before ear surgery or cochlear implant placement.

How is the test performed?

You will lie on a CT table with your head positioned so the scanner can capture very thin images of the temporal bones. The scan is quick and generally painless, although you must remain still and may be asked to hold your breath briefly.

How do I prepare for the test?

No special preparation is usually required for a CT scan without contrast. Remove metal objects, hearing aids, and removable dental items if instructed, and tell the technologist if you are pregnant, may be pregnant, or have had a serious reaction to iodinated contrast.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Temporal Bone CT Without Contrast

Frequently asked questions

Does this CT scan use contrast?
No. “Without contrast” means iodinated contrast dye is not used, so there is usually no need for contrast-related precautions or a contrast injection.
Is a temporal bone CT scan the same as a routine head CT?
No. A temporal bone CT uses focused, very detailed images of the ear bones and nearby structures. It is not a substitute for a routine head CT when evaluating the brain.
Will the scan show my hearing?
It shows the anatomy of the ear and nearby bones but does not directly measure hearing. A hearing test, such as audiometry, is usually needed to assess hearing function.
  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