Computed Tomography (CT) Scan of the Appendix Without Intravenous Contrast
A CT scan that creates detailed images of the appendix to evaluate abdominal pain and look for conditions such as appendicitis.
["This CT scan evaluates the appendix for inflammation, blockage, perforation, or other causes of abdominal pain without using injected contrast."]
Key facts at a glance
- LOINC
- 36434-9
- Short code
- CT Appendix WO contr
- Synonyms
- CT Appendix 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?
This is a CT scan focused on the appendix, a small organ attached to the large intestine. It uses X-rays and computer technology to produce cross-sectional images without injected contrast material.
Why might I need this test?
The scan may be ordered for pain in the lower-right abdomen or other symptoms that raise concern for appendicitis. It can also help evaluate complications such as an abscess, perforation, or blockage and may identify other causes of the symptoms.
How is the test performed?
You will lie on a table while the CT scanner moves around you and takes pictures. The scan is generally quick and does not use injected contrast for this test, although a radiologist may recommend another type of CT if more detailed images are needed.
How do I prepare for the test?
Follow the instructions from your care team about eating or drinking before the scan. Remove metal items, tell the technologist if you are pregnant or may be pregnant, and mention any relevant medications, allergies, or kidney problems.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
An abnormal result may indicate inflammation of the appendix, appendicitis, a blockage, perforation, or an abscess. A radiologist will interpret the images together with your symptoms, examination, and other tests, because CT findings can overlap with other abdominal conditions.
Short name
Appendix CT without contrast
Frequently asked questions
Does this test use contrast?
Is a CT scan of the appendix the same as a routine abdominal CT?
Will I be able to drive home afterward?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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