Skip to content

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 in your blood, which are parts of antibodies. It helps diagnose conditions like multiple myeloma or other antibody-related diseases.

Quick summary

["This test checks for abnormal antibody fragments that may signal underlying health concerns."]

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

Key facts at a glance

LOINC
21375-1
Short code
Lymphs Kappa/Lambda Bld
Synonyms
Lymphs Kappa/Lambda 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’s also used to monitor conditions like multiple myeloma, lymphoma, or other blood disorders.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or vein to draw blood. The process takes about 5 minutes, and you may feel a slight pinch.

What the Results Mean

Results show the concentration of free lambda light chains in your blood. Elevated levels may indicate conditions like multiple myeloma or other immune system disorders. Your provider will interpret the results in the context of your medical history and symptoms.

Common Conditions Monitored

This test helps diagnose and monitor conditions such as multiple myeloma (a cancer of plasma cells), Waldenström macroglobulinemia (a type of lymphoma), and other antibody-related diseases.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Free Light Chain Test

Frequently asked questions

What causes abnormal free lambda light chain levels?
Abnormal levels are often linked to conditions like multiple myeloma, lymphoma, or other immune disorders. Rarely, they can be due to infections, autoimmune diseases, or other systemic conditions. Your provider will consider your full medical picture.
How often will I need this test?
Frequency depends on your diagnosis and treatment plan. If you have a condition like multiple myeloma, you may need this test regularly to monitor disease activity or treatment effectiveness.
Can diet or lifestyle affect these test results?
Diet or lifestyle changes typically do not directly impact free light chain levels. However, avoid alcohol or medications that may affect blood tests before your appointment, as instructed by your provider.
  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