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Computed Tomography (CT) Scan of the Upper Arm Without Contrast

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

A CT scan creates detailed cross-sectional images of the upper arm to evaluate bones, muscles, and other soft tissues without using contrast dye.

Quick summary

["This imaging test can identify fractures, masses, infections, or other abnormalities in the upper arm without contrast dye."]

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

Key facts at a glance

LOINC
36491-9
Short code
CT Upper arm WO contr
Synonyms
CT Upper arm 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 scan of the upper arm uses X-rays and a computer to create detailed cross-sectional images of the arm. This version is performed without an injected contrast dye.

Why might I need this test?

Your clinician may order this test to evaluate an injury, persistent pain, swelling, or reduced movement. It can also help assess bone fractures, soft-tissue masses, infection, or other structural abnormalities.

How is the test performed?

You will lie on a table while a CT scanner rotates around the affected arm. The scan is quick and generally painless, although the scanner may make loud clicking or buzzing sounds.

How do I prepare for the test?

Tell the imaging staff if you are pregnant or may be pregnant and inform them of any medical devices, such as a joint replacement, in the area being scanned. Wear loose, comfortable clothing and follow any instructions provided by your clinician.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

The scan may show a fracture, bone lesion, muscle or fat abnormality, fluid collection, infection, or a soft-tissue mass. Findings should be interpreted by a radiologist in the context of your symptoms, examination, and other tests. Your healthcare professional will explain the results and discuss any follow-up needed.

Short name

CT Upper Arm Without Contrast

Frequently asked questions

Does this CT scan use contrast dye?
No. The words “without contrast” mean no injected contrast dye is used. Some CT studies may still use oral contrast, so confirm the instructions with the imaging center beforehand.
Is a CT scan of the upper arm painful?
The scan itself is not painful. You may be asked to hold still, and the scanner can be somewhat noisy or feel confined, but the imaging procedure is usually brief.
What can the scan detect?
CT imaging can show fractures and abnormalities involving bones, muscles, fat, and other soft tissues. It may also identify masses, fluid collections, or signs of infection.
  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