Serum Free Light Chains, Quantitative

Includes: Free Kappa Light Chains, Free Lambda Light Chains, and Kappa/Lambda Free Light Chains Ratio

1 or x3 or x3

Tube Type

Test ID LAB735
CPT Code(s) 83521x2
Group/Individual Test Group
Laboratory Performed by: Special Chemistry Laboratory
Tube Station 30
Specimen Routine: 5 mL whole blood/royal blue/serum separator/gold or red top blood collection tube
Micro: 2.5 mL blood/3 SST/gold or red microcollection devices
Stability Unspun 4 hrs
Room Temperature Not Acceptable
Refrigerator (2-8°C) 21 days
Frozen -20°C 14 days
Off Site Collections: Centrifuge sample; Aliquot Serum (min vol 750µl serum) & refrigerate within 4 hours of collection.
Availability Routine: Performed 3 days/week, Monday, Wednesday, Friday, no weekends, no holidays; Not available STAT
Turnaround Time 3 Days
Reference Range Normal:
Free Kappa Light Chains 0.33 - 1.94 mg/dL
Free Lambda Light Chains 0.57 - 2.63 mg/dL
Kappa/Lambda Ratio 0.26 - 1.65

Methodology: Turbidimetry

See numbered memo Core #134 dated February 24, 2017 for additional information.

-Multiple test requests with same sample type will require additional volumes for testing.
-Pediatric microcollection devices available from Phlebotomy Services

Reviewed by Christopher Parker on May 19, 2022

Note: Reference ranges provided on this web site are for guidance only, and may not reflect the most recent changes. Refer to laboratory reports for current reference data.

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514