CT Scan of the Lumbosacral Plexus Without Contrast
A computed tomography (CT) scan that creates detailed images of the lumbosacral plexus, the network of nerves in the lower back and pelvis, without using contrast dye.
["This CT scan evaluates the nerves of the lower back and pelvis and does not use injected contrast dye."]
Key facts at a glance
- LOINC
- 89840-3
- Short code
- CT Lumbosacral plexus WO contr
- Synonyms
- CT Lumbosacral plexus WO contr
- Category
- liver
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 44
- Ref high
- 147
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ct
- CPT
- 84075
- SNOMED
- 27550007
- 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 lumbosacral plexus uses X-rays and a computer to create detailed pictures of the nerves in the lower spine and pelvis. This version is performed without contrast dye.
Why might I need this test?
The scan may help evaluate lower back or pelvic nerve problems, such as pain, weakness, numbness, or tingling. It may also be used to assess injuries, masses, inflammation, or other structural changes affecting the nerves.
How is the test performed?
You will lie on a CT table while the scanner rotates around the area being examined. The images are usually reviewed by a radiologist, and your healthcare professional will discuss the results with you.
How do I prepare for the test?
Tell the imaging team about allergies, medications, pregnancy possibilities, and any prior reactions to contrast dye. Because this scan does not use contrast, there is usually no need to stop eating or drinking beforehand, but follow the instructions provided by the imaging center.
Reference range
Adult: 44-147 U/LN/A
No special preparation required. Avoid fatty meals before the test if possible.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal findings may indicate nerve injury, swelling, compression, a mass, or another structural condition affecting the lumbosacral plexus. The results are interpreted together with your symptoms, medical history, physical examination, and any other tests. Your healthcare professional will explain what the images mean and whether additional evaluation is needed.
Short name
CT Lumbosacral Plexus Without Contrast
Frequently asked questions
Does this CT scan use contrast dye?
What does the lumbosacral plexus do?
Will the test be painful or unsafe?
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