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Immunoglobulin M (IgM) Antibody to *Lambdachain* (Serum or Plasma)

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

This test measures antibodies in your blood that target the lambda light chain protein, often part of immunoglobulin molecules. It may be used to assess immune responses or detect certain autoimmune conditions.

Quick summary

["This test helps identify immune activity or potential autoimmune responses involving lambda light chains."]

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

Key facts at a glance

LOINC
74870-7
Short code
IgM kappa/M lambda SerPl
Synonyms
IgM kappa/M lambda SerPl
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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 Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like chronic fatigue, joint pain, or unexplained infections, or if you have a history of autoimmune diseases. It could also be part of a broader evaluation for conditions affecting antibody production or light chain disorders.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, typically drawn from a vein in your arm. If you’re on blood thinners, let your provider know beforehand.

How the Test Works

Blood is collected and analyzed using an immunoassay method to detect IgM antibodies specific to lambda light chains. The result indicates the presence or level of these antibodies in your serum or plasma.

What the Results Mean

Results may show elevated or low levels of these antibodies, which could signal an immune response, autoimmune activity, or other underlying conditions. Your provider will interpret results in the context of your medical history and symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgM Anti-Lambda Light Chain Antibody

Frequently asked questions

What could elevated or abnormal levels indicate?
Elevated IgM anti-lambda light chain antibodies might suggest an autoimmune response, chronic infection, or certain monoclonal gammopathies. Low or absent levels may warrant further investigation into immune function or light chain disorders.
How often should this test be repeated?
If your provider orders this test, they will determine how often to repeat it based on your symptoms, medical history, and test results. Follow their guidance for follow-up testing.
Can lifestyle changes affect this test result?
While lifestyle factors like diet or stress may influence overall immune function, they typically do not directly alter antibody levels measured in this test. Your provider will consider all relevant factors when interpreting results.
  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