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Kappa Light Chain in Serum or Plasma

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

This test measures the amount of kappa light chains, a type of protein fragment found in your blood. These fragments are part of antibodies and can be elevated in certain health conditions.

Quick summary

["Elevated levels may signal underlying immune system issues or diseases like multiple myeloma."]

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

Key facts at a glance

LOINC
40636-3
Short code
Kappa LC Ur Ql IFE
Synonyms
Kappa LC Ur Ql IFE
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
immunofixation
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

What Is a Kappa Light Chain Test Used For?

Doctors may order this test to diagnose or monitor conditions such as multiple myeloma, lymphoma, or other blood-related disorders. It helps assess whether abnormal antibody production is occurring and whether treatment is working effectively.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The sample is then processed to separate and measure the kappa light chain protein levels in your serum or plasma.

Preparation and Sample Collection

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if instructed by your healthcare provider. The blood sample is collected in a sterile tube and sent to a lab for analysis.

What Are Normal Results?

Normal results vary by lab and individual, but elevated levels of kappa light chains may indicate conditions like monoclonal gammopathy or plasma cell dyscrasias.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Kappa Light Chain

Frequently asked questions

Why might my doctor order this test?
Your doctor may recommend this test if you have symptoms like fatigue, bone pain, frequent infections, or if they suspect a blood-related disease like multiple myeloma or lymphoma. It’s also used to monitor treatment progress in patients already diagnosed with these conditions.
What does it mean if my kappa light chain levels are high?
High levels may suggest an overproduction of abnormal proteins, which could indicate conditions like multiple myeloma or other plasma cell disorders. Your doctor will discuss further testing or treatment options based on these results.
Can lifestyle changes affect kappa light chain levels?
While diet and exercise can support overall health, they typically do not directly influence kappa light chain levels. However, managing chronic conditions like diabetes or autoimmune diseases may indirectly impact test 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