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TEST ID KCSF Immunoglobulin Kappa Free Light Chain, Spinal Fluid

Reporting Name

Kappa Free Light Chain, CSF

Specimen Type

CSF


Ordering Guidance


For evaluation of multiple sclerosis, Multiple Sclerosis (MS) Profile, Serum and Spinal Fluid, SFIG/ Cerebrospinal Fluid IgG Index Profile, Serum and Spinal Fluid in conjunction with OLIG / Oligoclonal Banding, Serum and Spinal Fluid are still available as individually orderable tests.

 

In addition, a multiple sclerosis profile (MSP3 / Multiple Sclerosis (MS) Profile, Serum and Spinal Fluid) is available. This profile starts with immunoglobulin kappa free light chain testing. When that is borderline or elevated, additional testing for oligoclonal banding will be performed and results interpreted accordingly.



Specimen Required


Specimen Type: Spinal fluid

Container/Tube: Sterile vial

Specimen Volume: 1 mL

Collection Instructions: Label specimen as spinal fluid.


Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
CSF Frozen (preferred) 28 days
  Refrigerated  72 hours
  Ambient  24 hours

Method Name

Nephelometry

Reject Due To

Gross hemolysis Reject
Gross icterus OK

Reference Values

Medical Decision Point: 0.1000 mg/dL

Positive: ≥0.1000 mg/dL

Borderline: 0.0600 mg/dL-0.0999 mg/dL

Negative <0.0600 mg/dL

Day(s) Performed

Monday through Friday

Report Available

1 to 3 days

Specimen Retention Time

14 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

83521

Useful For

Diagnosing multiple sclerosis and other demyelinating conditions

 

Evaluating patients who present with a clinically isolated syndrome in which the patient reports symptoms (headaches, optic neuritis, fatigue, and many others, depending on the disease location) characteristic of inflammation and demyelination of the central nervous system

 

Recommended in cases where the imaging findings are atypical and in populations in which multiple sclerosis is less common (eg, children, older individuals, or non-White populations)

 

The test is not useful when a clear diagnosis is already known because a positive result does not correlate with severity of the disease or disease outcomes.