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Free kappa light chain (serum/plasma)

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

This test measures the amount of free kappa light chains, a component of antibodies, in your blood. It helps assess conditions affecting antibody production or immune system function.

Quick summary

["Free kappa light chains can help diagnose or monitor certain immune disorders."]

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

Key facts at a glance

LOINC
38176-4
Short code
Kappa LC Free Ur-mCnc
Synonyms
Kappa LC Free Ur-mCnc
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your healthcare provider may order this test to evaluate conditions such as multiple myeloma, lymphoma, or other immune-related diseases. It can also be used to monitor treatment progress or detect abnormalities in antibody production.

What Does the Test Measure?

The test measures the concentration of free kappa light chains in your blood. These are small protein fragments that can appear when antibodies break down or are produced in excess.

Sample Collection and Preparation

A blood sample is typically collected from a vein in your arm. The sample is then sent to a lab for analysis. Free light chains are measured after separating the serum or plasma from blood cells.

What Are Possible Results?

Results are usually reported as a numerical value representing the mass concentration of free kappa light chains. Interpretation depends on clinical context and comparison with known reference ranges for your age and health status.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Free kappa light chain

Frequently asked questions

What causes elevated free kappa light chains?
Elevated levels are often linked to conditions like multiple myeloma, lymphoma, or other plasma cell dyscrasias. They may also appear in autoimmune diseases or after certain treatments that affect antibody production.
What does it mean if my test results are abnormal?
An abnormal result may signal an underlying immune disorder or other health issue. Your healthcare provider will discuss the results with you and may recommend further testing or adjustments to your treatment plan.
Can lifestyle changes affect this test?
While diet and exercise generally do not directly impact free kappa light chain levels, certain medications (e.g., chemotherapy, steroids) or chronic illnesses may influence results. Always follow your provider’s guidance.
  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