CT Scan of the Abdomen and Retroperitoneum with Contrast
A CT scan uses X-rays and contrast to create detailed images of the abdomen and retroperitoneum, helping evaluate organs, blood vessels, and nearby structures.
["This imaging test can identify many conditions affecting the abdomen and retroperitoneum, including masses, inflammation, stones, bleeding, and bowel obstruction."]
Key facts at a glance
- LOINC
- 24567-0
- Short code
- Deprecated Abd>Retroperitoneum CT W cont
- Synonyms
- Deprecated Abd>Retroperitoneum CT W cont
- 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 computed tomography, or CT, scan of the abdomen and retroperitoneum, the area behind the abdominal cavity. Iodinated contrast may be given through a vein to improve the visibility of blood vessels, organs, and other tissues.
Why might I need this test?
Your clinician may order this scan to evaluate unexplained abdominal or back pain, swelling, fever, or changes in bowel function. It can also help assess injuries, masses, infection, kidney stones, bleeding, bowel obstruction, and other conditions.
How is the test performed?
You will lie on a moving table while a CT scanner takes X-ray images from different angles. If IV contrast is used, a needle may be placed in a vein and you may be asked to hold your breath briefly. The procedure usually takes a relatively short time and is generally painless, although the contrast injection may cause a warm sensation.
How do I prepare for the test?
Follow the imaging center's instructions, because fasting or taking contrast by mouth may be required for some examinations. Tell the care team about kidney disease, prior reactions to contrast, allergies, pregnancy or possible pregnancy, and medicines you take. Do not stop any medicine unless your clinician instructs you to do so.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal findings may indicate conditions such as an abdominal mass, enlarged lymph nodes, inflammation or infection, kidney or urinary stones, bleeding, intestinal obstruction, or disease involving the major blood vessels. The radiologist interprets the images and sends the report to your ordering clinician, who explains the findings in the context of your symptoms and examination.
Short name
CT Abdomen/Retroperitoneum with Contrast
Frequently asked questions
Does this test use radiation?
What is the difference between contrast and non-contrast CT?
Will I know the results right away?
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