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Computed Tomography (CT) Scan of the Retroperitoneum Without Contrast

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

A CT scan uses X-rays to create detailed images of organs and tissues behind the abdominal lining without using contrast dye.

Quick summary

["This scan can help identify problems in the kidneys and other retroperitoneal organs that may not be visible on standard X-rays."]

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

Key facts at a glance

LOINC
42291-5
Short code
CT Retroperitoneum WO contr
Synonyms
CT Retroperitoneum 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 retroperitoneal CT scan is an imaging test that creates detailed pictures of the organs and tissues behind the abdominal lining. This version is performed without contrast dye.

Why might I need this test?

Your clinician may order this scan to evaluate abdominal or flank pain, kidney stones, infection, bleeding, injury, or an abnormal mass. It may also help assess organs such as the kidneys, adrenal glands, pancreas, and major blood vessels.

How is the test performed?

You will lie on a table while a CT scanner rotates around you and takes X-ray images. The scan is painless and usually takes a short time, although you may need to hold your breath briefly for clearer images.

How do I prepare for the test?

Fasting is usually not required for a CT scan without contrast, but follow your appointment instructions. Remove jewelry and other metal objects, and tell the care team if you are or might be pregnant.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CT Retroperitoneum Without Contrast

Frequently asked questions

Does this CT scan use contrast dye?
No. This test is specified as being performed without contrast, so contrast dye is generally not given. Follow any instructions from the imaging center in case additional preparation is required.
Is a retroperitoneal CT scan the same as a routine abdominal CT?
Not always. A retroperitoneal CT focuses on the deep organs and tissues behind the abdominal lining, while a routine abdominal CT may cover a broader area of the abdomen and pelvis.
Will I know the results right after the scan?
A radiologist will review the images and send a report to your ordering clinician. Your clinician will explain the findings and discuss any additional testing or treatment that may be needed.
  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