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Regional Medical Lab
Test Directory


Kappa/Lambda Light Chains Only - Serum

Order Name Free Light Only
Test Number: 6907201
Revision Date 01/01/2022
Test Name Methodology LOINC Code
Free Kappa Light Chains
Turbidometric 36916-5 
Free Lambda Light Chains
Turbidometric 33944-0 
Free Kappa/Lambda Light Chains Ratio
Calculation 48378-4 
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 2 mL (1 mL) Serum Clot Activator SST Refrigerated
Instructions Allow specimen to clot completely at room temperature. Separate serum from cells ASAP or within 2 hours of collection.
Stability After separation from cells: Ambient 4hours, Refrigerated 7 days, Frozen 1 months (avoid repeated freeze/thaw cycles).
Testing Schedule 1-3 Days  
Expected TAT Mon - Fri   
Clinical Use Quantitative serum Kappa and Lambda with Kappa/Lambda ratio results 
Notes Kappa/Lambda Light Chains without Pathology Interpretation
CPT Code(s) 83521x2
Lab Section Immunology - Serology