Free kappa light chain (serum/plasma)
This test measures the amount of free kappa light chains in your blood, which are small protein fragments produced by white blood cells. These fragments can be elevated in certain health conditions.
["Free kappa light chains help diagnose and monitor conditions affecting plasma cells, like multiple myeloma or certain autoimmune diseases."]
Key facts at a glance
- LOINC
- 44604-7
- Short code
- Kappa LC Free Ur Ql IFE
- Synonyms
- Kappa LC Free 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
Why This Test Might Be Ordered
Your healthcare provider may recommend this test if you have symptoms of a blood-related condition, such as fatigue, unexplained weight loss, bone pain, or frequent infections. It may also be used to monitor treatment progress or check for recurrence of conditions like multiple myeloma, lymphoma, or other plasma cell disorders.
What to Expect Before the Test
No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw blood, similar to a routine blood draw. If you are on blood thinners, let your provider know before the test.
What the Test Results Mean
Free kappa light chains are normally present in small amounts in the blood. Elevated levels can indicate conditions such as multiple myeloma, where abnormal plasma cells produce too many light chains. Very low levels might suggest certain immune system disorders or other conditions affecting plasma cell function.
Common Conditions Monitored
This test is often used to diagnose or monitor multiple myeloma, Waldenström macroglobulinemia, and other plasma cell dyscrasias. It can also help identify other conditions where abnormal light chain production occurs, such as certain lymphomas or autoimmune diseases.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Elevated free kappa light chains can signal an overproduction of these proteins by plasma cells, which may be linked to cancers like multiple myeloma or monoclonal gammopathy of undetermined significance (MGUS). Monitoring these levels helps track disease progression, response to treatment, and the effectiveness of therapies such as chemotherapy or immunotherapy.
Short name
Free Kappa Light Chain
Frequently asked questions
What does an elevated free kappa light chain level mean?
Can diet or lifestyle affect free kappa light chain levels?
How often will I need this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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