Kappa/Lambda Light Chains, Free with Ratio and Reflex to Immunofixation, Serum (KLFRRI)

Test Code

Quest Code

Alias/See Also
KLFRRI, light chains

CPT Codes
83520 (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
2 mL serum

Minimum Volume
1 mL

Transport Container
Preferred: Gold top; Acceptable: Plain red top

Transport Temperature
Room temperature

Specimen Stability
Room temperature: 72 hours
Refrigerated: 7 days
Frozen: 30 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis • Grossly lipemic • Microbially contaminated • Heavy visible particulate


Reference Range
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

Performing Laboratory
Quest Diagnostics - South Region

The CPT Codes provided in this document 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 payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.