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Brachial Plexus Neurochemistry Profile (Screening)

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

This test measures certain substances in your blood that may help assess nerve function in the brachial plexus, a network of nerves connecting the arm to the spinal cord. It is often used to evaluate potential nerve damage or dysfunction.

Quick summary

["This screening helps identify possible nerve-related issues in your arm’s nerve network."]

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

Key facts at a glance

LOINC
24582-9
Short code
MR Brachial plexus
Synonyms
MR Brachial plexus
Category
chemistry
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
mr
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

Why This Test Is Done

Your doctor may recommend this test if you’ve experienced symptoms like numbness, tingling, weakness, or pain in your arm or hand, or if you’ve had trauma (such as a fall or injury) to the neck or shoulder region that could affect the brachial plexus nerves.

What to Expect Before the Test

You’ll typically have a simple blood draw from a vein in your arm. The process is quick and usually painless. No special preparation is needed, but fasting may be advised depending on the specific tests included.

What the Test Measures

This screening evaluates the presence of specific biomarkers (such as neurotransmitters, metabolites, or proteins) that can indicate nerve health or dysfunction in the brachial plexus. Results help determine if further evaluation or treatment is needed.

Possible Results and Next Steps

If your results are abnormal, your doctor may order additional tests (like nerve conduction studies) or recommend treatments tailored to your symptoms, such as physical therapy or medications.

Reference range

Adult: 44-147 U/LN/A

Specimen: serum

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Brachial Plexus Screening

Frequently asked questions

What does an abnormal result mean?
An abnormal result may suggest nerve damage or inflammation in the brachial plexus, but it doesn’t confirm a diagnosis alone. Your doctor will review the results alongside your medical history, symptoms, and other tests to determine the best course of action.
Can this test detect all brachial plexus issues?
This screening is a general assessment and may not detect every possible issue. More specific tests, like nerve conduction studies or imaging, are often needed for a full evaluation.
How soon will I get results?
Results are typically available within a few days to a week, depending on your lab’s processing time. Your doctor will contact you with the findings and next steps.
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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