Computed Tomography (CT) Scan of the Appendix with Intravenous Contrast
A CT scan of the lower-right abdomen is used to evaluate the appendix for inflammation, abscess, obstruction, or perforation.
["This scan can help identify appendicitis and other conditions that may cause abdominal pain."]
Key facts at a glance
- LOINC
- 36145-1
- Short code
- CT Appendix W contr IV
- Synonyms
- CT Appendix W contr IV
- 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 that creates detailed images of the appendix, the small organ attached to the large intestine in the lower-right abdomen. Intravenous contrast, usually an iodine-based dye, may be given through a vein to improve the visibility of inflammation, blood vessels, and other structures.
Why might I need this test?
The test may be ordered to evaluate appendicitis, an abscess, bowel obstruction, or a hole in the appendix. It may also help assess other causes of lower-right abdominal pain when the symptoms or initial examination are unclear.
How is the test performed?
You will lie on a table while a CT scanner takes X-ray images from different angles. A technologist may place an IV line in your arm or hand and inject contrast, then watch you briefly for a reaction. The procedure usually takes a short time and does not require sedation.
How do I prepare for the test?
Follow the imaging center's instructions about eating, drinking, medications, and whether oral contrast is required. Tell the care team if you have had an allergic reaction to iodinated contrast, have kidney disease, or are pregnant or breastfeeding, because these factors may affect the study or how contrast is used.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal findings may indicate appendicitis, an abscess around the appendix, obstruction, or perforation. Enlargement, wall thickening, surrounding fat inflammation, and fluid collections are findings a radiologist may interpret in relation to your symptoms and examination. CT can also identify other abdominal conditions that resemble appendicitis.
Short name
CT Appendix with IV Contrast
Frequently asked questions
Does this test involve radiation?
Is intravenous contrast always required for an appendix CT?
Will I know the results immediately?
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