KLFU – “Kappa/Lambda Light Chains, Free with Ratio, Urine” replaced by UFKL – “Urine Kappa/Lambda Quantitative Free Light Chains”

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Inactivated/Replace Test

Effective Date

06/30/2026

Included in Report

WML Test Directory Update | June 2026

Replacement Test

URINE KAPPA/LAMBDA QUANTITATIVE FREE LIGHT CHAINS

Inactivated Test Details

Mnemonic

KLFU

Ordering Code

3434060

CPT-4 Codes(s)

83521 x 2

Replacement Test Details

Mnemonic

UFKL

Ordering Code

3000974

CPT-4 Codes(s)

83521x2

Turnaround Time
1-5 days
Performed
Tuesday, Friday
Legacy Code
UFKL
Example Report
Download

Specimen Information

Collect

Random urine

Specimen Preparation

Send 2.0 mL urine in a screw capped plastic vial.

Alternate Specimen

24-hour urine

Minimum Volume

1.0 mL

Transport Temperature

Refrigerated

Rejection Criteria

Microbial contaminated; gross hemolysis

Stability

Room temperature: Undetermined
Refrigerated: 21 days
Frozen: 6 months

Methodology

Immunoturbidimetry/Optilite
more

Reference Range

Kappa Light Chain, Free, Urine: ≤ 32.90 mg/L
Lambda Light Chain, Free, Urine: ≤ 3.79 mg/L
Kappa/Lambda Light Chains Free Ratio, Urine: ≤ 8.69
more

Performing Laboratory

Warde Medical Laboratory
more

New York DOH Approval Status

Yes
more

Interface Map for UFKL

Test Name Ordering Code Result Code Component Name LOINC Code AOE Prompt Units
Urine Kappa/Lambda Quantitative Free Light Chains3000974
3000976Urine Free Kappa Light Chain38176-4No
3000977Urine Free Lambda Light Chain38178-4No
3000978Urine Kappa/Lambda FLC Ratio41759-2No

The CPT codes provided are for general informational purposes only and are based on an interpretation of AMA guidance. It is the sole responsibility of the billing party to determine CPT codes. Any questions regarding coding should be directed to the paying party.

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