CT-Guided Lumbar Nerve Block
A minimally invasive procedure in which your doctor uses CT scan guidance to place medication near specific nerves in your lower back, helping to reduce inflammation and relieve pain.
{"Uses CT imaging to precisely guide a pain-relieving injection to specific nerves in the lumbar spine","Helps diagnose the source of back pain while providing temporary relief","Performed by a pain specialist or radiologist in an outpatient setting","Procedure takes about 15-30 minutes with minimal recovery time","Results can provide relief lasting from several days to several months"}
Key facts at a glance
- LOINC
- 35932-3
- Short code
- CTLB
- Synonyms
- CT Guided L-spine Nerve block
- Category
- cardiac
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 3.5
- Ref high
- 5
- Critical range
- 2.5 N/A – 6.5 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- ≥ 18 years
- Method
- CT-guided percutaneous injection
- CPT
- 27096
- SNOMED
- 399097008
- 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 a CT-Guided Lumbar Nerve Block?
A CT-guided lumbar spine nerve block is a minimally invasive procedure that uses computed tomography (CT) imaging to help your doctor precisely locate and inject medication near specific nerves in your lower back. The injection typically contains a local anesthetic and sometimes a steroid medication to reduce inflammation and provide pain relief.
How Should I Prepare?
Before the procedure, inform your doctor about all medications you are taking, especially blood thinners. You may need to stop certain medications temporarily. Fasting is usually not required. Wear comfortable, loose-fitting clothing. Bring someone to drive you home if you receive sedation. Your doctor will provide specific instructions based on your individual health situation.
What Happens During the Procedure?
You will lie face down on the CT scanning table. The procedure area will be cleaned and numbed with a local anesthetic. Using CT images for guidance, your doctor will insert a thin needle to the precise location near the targeted nerve. Once confirmed, the medication will be injected. You may feel pressure or mild discomfort. The entire procedure typically takes 15-30 minutes.
What Happens After the Procedure?
After the procedure, you will be monitored briefly in the recovery area. You may experience temporary numbness or weakness in your legs. Most patients can resume light activities the same day and normal activities within 24-48 hours. Avoid driving for at least 24 hours if you received sedation. Apply ice to the injection site if needed for soreness.
Reference range
Adult: 3.5-5.0 mmol/LN/A
Confirm patient identity and procedure side. Obtain informed consent. Review prior imaging studies. Ensure no contraindications to CT-guided procedure. Patient should be positioned prone or lateral for lumbar spine access. Verify coagulation status. Discontinue anticoagulants if indicated per physician order.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This procedure serves both diagnostic and therapeutic purposes. It helps identify which specific nerve is causing your pain by providing temporary relief. If the pain improves after the injection, it confirms that the targeted nerve is the source of your discomfort. The therapeutic benefit can last from several days to several months, depending on the individual and the medication used.
Common conditions treated with lumbar nerve blocks include chronic lower back pain, sciatica, herniated discs, spinal stenosis, and facet joint arthritis. This approach provides an alternative to surgery for many patients and can significantly improve quality of life for those with chronic pain conditions.
Frequently asked questions
Is the procedure painful?
How long does the pain relief last?
Are there any risks or side effects?
How many injections will I need?
Will I be awake during the procedure?
Sources
- 1
- 2
- 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