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Anti-MDA5 Antibody (Serum/Plasma) – Immunoassay

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

This test measures the presence of antibodies against the MDA5 protein, which may be linked to certain inflammatory or autoimmune conditions affecting the lungs or skin.

Quick summary

["Helpful for diagnosing rare inflammatory diseases like anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitis or dermatomyositis-related conditions."]

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

Key facts at a glance

LOINC
107563-9
Short code
MDA5 Ab SerPl Ql
Synonyms
MDA5 Ab SerPl Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Anti-MDA5 Antibody Testing Used For?

Doctors may order this test if you have symptoms like lung inflammation (e.g., interstitial lung disease), skin rashes, or muscle weakness, especially when other tests (like ANCA) are inconclusive. It helps identify specific autoimmune responses tied to rare but serious conditions.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The serum or plasma is then tested in a lab using an immunoassay method to detect the presence of your antibodies against the MDA5 protein.

What Does a Positive Result Mean?

A positive result suggests an immune system response against the MDA5 protein, which may indicate conditions like anti-MDA5-associated vasculitis or dermatomyositis. Further evaluation with a healthcare provider is needed to determine next steps.

What Are Common Symptoms Linked to This Test?

Symptoms may include persistent lung issues (e.g., shortness of breath), skin rashes (e.g., myositis), or muscle weakness. These can vary widely and may overlap with other autoimmune diseases.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test helps differentiate rare inflammatory diseases from more common conditions by identifying a specific antibody profile. Early detection can guide treatment plans, such as managing inflammation or autoimmune activity in the body.

Short name

Anti-MDA5 Antibody

Frequently asked questions

Why might my doctor recommend this test?
Your doctor may recommend it if you have unexplained lung problems, skin rashes, or muscle weakness that don’t fit typical patterns of other conditions. It’s often used when other tests (like ANCA) are negative or inconclusive.
What does a negative result mean?
A negative result means your blood sample did not show detectable antibodies against MDA5 at the time of testing. However, this doesn’t rule out the possibility of the condition later in your disease course or if retested.
Could this test be affected by medications?
Some immunosuppressive or anti-inflammatory medications may influence antibody levels, but this is rare. Always discuss your medications with your doctor before or after testing.
  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