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Kappa/Lambda Light Chains, Free with Ratio and Reflex to Immunofixation

Test Code


CPT Code(s)

83883 (x2)


If Kappa/Lambda, Free is <0.26 or >1.65, Immunofixation will be performed at an additional charge (CPT code(s): 86334).

Preferred Specimen(s)

2 mL serum

Minimum Volume

1 mL

Transport Container

Transport tube

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 7 days
Refrigerated: 21 days
Frozen: 90 days

Reject Criteria

Gross hemolysis • Gross lipemia • Microbial contaminated serum • Specimens containing heavy visible particulate



Performing Laboratory

Quest Diagnostics-Tampa
4225 E Fowler Avenue
Tampa, FL 33617-2026

Reference Range(s)

Kappa Light Chain, Free, Serum 3.3-19.4 mg/L
Lambda Light Chain, Free, Serum 5.7-26.3 mg/L
Kappa/Lambda Light Chains Free with Ratio, Serum 0.26-1.65

Alternative Name(s)

Light Chains

LOINC®' Code(s)

The Result and LOINC information listed below should not be used for electronic interface maintenance with Quest Diagnostics. Please contact the Quest Diagnostics Connectivity Help Desk for more information at 800-697-9302.

NOTE: The codes listed in the table below are not orderable Test Codes.

Result NameLOINC CodeComponent Name
45505650KAPPA LIGHT CHAIN, FREE, SERUM36916-5Immunoglobulin light chains.kappa.free
45505700LAMBDA LIGHT CHAIN, FREE, SERUM33944-0Immunoglobulin light chains.lambda.free
45505750KAPPA/LAMBDA LIGHT CHAINS FREE WITH RATIO, SERUM48378-4Immunoglobulin light chains.kappa.free/Immunoglobulin light chains.lambda.free

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

LOINC assignment is based on a combination of test attributes, including the method used by the performing laboratory. For tests not performed by Quest Diagnostics, codes are assigned by the performing laboratory.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.