Days Set Up
Monday - Friday
Analytic Time
MiChart Code
Immunoglobulin Free Light Chains, Blood
Soft Order Code

Test Updated:


Kappa Free Light Chain
Lambda Free Light Chain
Serum Free Lightchain

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Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

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Test Overview

Test Methodology


Test Usage

Aids in the diagnosis and monitoring of multiple myeloma, lymphocytic neoplasms, Waldenstrom's macroglobulinemia, amyloidosis, light chain deposition disease and connective tissue diseases such as systemic lupus erythematosus. Elevated serum levels of monoclonal free light chains are associated with malignant plasma cell proliferation (eg. multiple myeloma), primary amyloidosis and light chain deposition disease. Raised serum levels of polyclonal free light chains may be associated with automimmune diseases such as systemic lupus erythematosus.

Reference Range

Kappa Free Light Chain: 0.33 - 1.94 mg/dL, Lambda Free Light Chain: 0.57 - 2.63 mg/dL, Kappa/Lambda FLC Ratio: 0.26 - 1.65.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Onsite

Collect specimen in SST tube.

Collection Offsite

Collect specimen in SST tube. Centrifuge, aliquot serum into a plastic vial and refrigerate.

Yellow Top Tube
Normal Volume
0.5 mL serum
Minimum Volume
0.3 mL serum

Billing Information

CPT Code
83883 x2
Pro Fee Code
44793-8 IFLC, 36916-5 KFLC, 33944-0 LFLC, 15189-4 K/LFLC

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.