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Distal Muscle Weakness Multiplex Biomarker Panel (Serum/Plasma)

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

This test measures multiple biomarkers linked to muscle weakness, particularly in the distal (far) muscles, often evaluated in conditions affecting nerve or muscle function.

Quick summary

["This panel helps identify underlying causes of muscle weakness by checking for specific proteins or substances in your blood."]

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

Key facts at a glance

LOINC
103731-6
Short code
Distal weak multi Bld/T
Synonyms
Distal weak multi Bld/T
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What This Test Measures

The test includes several biomarkers that may indicate issues like nerve damage, muscle degeneration, or metabolic disorders. These could include markers for neurofilaments, myostatin, or other proteins associated with muscle or nerve health.

Why It Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like muscle weakness in the legs, arms, or hands that don’t improve with rest or physical therapy. It’s also used in diagnosing conditions such as peripheral neuropathy, muscular dystrophy, or other neuromuscular diseases.

Common Conditions Linked to This Test

Conditions that might prompt this test include chronic nerve damage (neuropathy), muscle wasting disorders, or metabolic imbalances affecting muscle function. It can also be part of a broader evaluation for unexplained muscle weakness.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. The test is quick and typically done in a lab setting.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

How long will the results take to come back?
Results are usually available within 1 to 3 business days, depending on your lab’s processing time. Your healthcare provider will discuss them with you.
Can I eat or drink before this test?
You can eat and drink normally before the test. No fasting is required.
Is there any risk or discomfort with this blood test?
The blood draw is generally safe and well-tolerated. You may feel slight discomfort, but most people experience only minor bruising or soreness at the site. Rarely, there may be a small risk of infection or excessive bleeding, but these are uncommon.
  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