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Serum Lambda Light Chain Immunoglobulin (Free Light Chain) Profile

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

This test measures the levels of free lambda light chains, a component of antibodies, in your blood. It helps assess conditions affecting the production or breakdown of antibodies, such as multiple myeloma or other plasma cell disorders.

Quick summary

["This test can help diagnose or monitor conditions linked to abnormal antibody production."]

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

Key facts at a glance

LOINC
17224-7
Short code
Lymphs Lambda/lymph NFr Bld
Synonyms
Lymphs Lambda/lymph NFr Bld
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like unexplained fatigue, frequent infections, bone pain, or kidney issues. It may also be used to monitor conditions like multiple myeloma, lymphoma, or other blood disorders that affect antibody production.

What to Expect Before the Test

No special preparation is needed. You may have blood drawn from a vein in your arm, similar to other blood tests. If you’re on blood thinners, let your provider know before the test.

How the Test Works

Blood is drawn and sent to a lab, where it’s analyzed to measure the concentration of free lambda light chains using an immunoassay method. This helps determine if levels are elevated or low, which can indicate underlying health issues.

What the Results Mean

Results are often reported as two separate values: free lambda light chain and free kappa light chain. An imbalance between these can signal conditions like multiple myeloma or other plasma cell disorders. Your provider will interpret the results in the context of your symptoms and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Free Light Chain Test

Frequently asked questions

What does an abnormal result mean?
An elevated free lambda light chain level alone may not indicate a problem, but it can be part of a broader evaluation for conditions like multiple myeloma or other plasma cell dyscrasias. Your provider will review the results alongside other tests and your symptoms to guide further action.
Can this test detect early signs of disease?
Yes, this test can help detect imbalances in light chains that may not be obvious through other tests. It’s often used as part of a screening or monitoring plan for patients with suspected blood disorders.
How often should I get this test?
The frequency depends on your medical condition and provider’s recommendations. If you have a known disorder like multiple myeloma, you may need regular monitoring. If this is a one-time screening, your provider will advise when to follow up.
  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