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Immunoglobulin Light Chain Profile (Serum)

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

This test measures the levels of light chains produced by your immune system’s B cells. Light chains are small protein fragments that can appear in abnormal amounts in certain health conditions.

Quick summary

["Light chains help diagnose conditions like multiple myeloma or other plasma cell disorders."]

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

Key facts at a glance

LOINC
44792-0
Short code
Immunoglobulin LC Pnl Ur
Synonyms
Immunoglobulin LC Pnl Ur
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

What Is a Light Chain Profile Used For?

A light chain profile helps doctors identify whether your immune system is producing too many light chains. This can be important if you have symptoms like fatigue, bone pain, or unexplained infections, which might suggest a condition like multiple myeloma or monoclonal gammopathy.

How Is This Test Performed?

A blood sample is drawn from a vein in your arm. The blood is then processed to separate the serum, where light chain levels are measured using an immunoassay method. This test does not require fasting.

Why Might I Need This Test?

Your doctor may order this test if you have symptoms of a plasma cell disorder, such as persistent fatigue, frequent infections, or unexplained weight loss. It may also be used as part of monitoring for conditions like multiple myeloma or other blood-related cancers.

What Do My Results Mean?

Results show the concentration of two types of light chains: kappa (κ) and lambda (λ). Abnormal levels may indicate an overproduction of light chains, which can be linked to conditions like multiple myeloma or benign monoclonal gammopathy.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Light Chain Profile

Short name

Ig Light Chain Test

Frequently asked questions

Why do doctors check light chain levels?
Doctors check light chain levels to detect or monitor conditions where the immune system produces too many light chains, such as multiple myeloma. High levels can cause kidney problems or other complications.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on your lab’s processing time.
What if my results are abnormal?
If your results show abnormal light chain levels, your doctor may recommend further testing, such as bone marrow biopsy or additional blood tests, to determine the cause and next steps.
  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