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Test ID FQFKL Kappa and Lambda Free Light Chains (Bence Jones Protein), Quantitative, Urine

Method Name

Qualitative Immunofixation Electrophoresis


Quantitative Nephelometry

Reporting Name

Quant Free Kappa/Lambda Light Chains

Specimen Type


Specimen Required

Two 4 mL aliquots from a well mixed 24-hour urine collection. No preservative. Refrigerate specimen during collection. Send specimen refrigerate in 2 plastic, 6 mL tubes. (MML Supply T465).

Note:  1. Keep refrigerate at all times

          2. Total volume and collection time interval required.

Specimen Minimum Volume

4 mL (2 vials 2 mL each)

Specimen Stability Information

Specimen Type Temperature Time
Urine Refrigerated (preferred) 7 days
  Ambient  2 hours

Reference Values

Total Protein:                                     10-140 mg/d

Albumin, Urine:                                 Detected

Alpha-1, Globulins, Urine:                None Detected

Alpha-2, Globulins, Urine:                None Detected

Beta Globulins, Urine:                        None Detected

Gamma, Urine:                                   None Detected

Free Urinary Kappa Light Chains:      0.14-2.42 mg/dL

Free Urinary Kappa Excretion/Day:   by report

Free Urinary Lambda Light Chains:   0.02-0.67 mg/dL

Free Urinary Lambda Excretion/Day: by report

Free Urinary Kappa/Lambda Ratio:    2.04-10.37 (ratio)

IFE Interpretation                                by report


Test Information: Total Protein

Total urinary protein is determined nephelometrically by adding the albumin and Kappa and/or Lambda light chains. This value may not agree with the total protein as determined by chemical methods, which characteristically underestimate urinary light chains.

Day(s) and Time(s) Performed

Monday through Friday

Performing Laboratory

ARUP Laboratories

CPT Code Information

83883/x2 Nephelometry, kappa/lambda

84156/ Total Protein

86335 /Immunofixation electrophoresis; other fluids

LOINC Code Information

Test ID Test Order Name Order LOINC Value
FQFKL Quant Free Kappa/Lambda Light Chains In Process


Result ID Test Result Name Result LOINC Value
Z2622 Hours Collected 30211-7
Z2623 Total Volume 19153-6
Z2624 Total Protein 2889-4
Z2625 Albumin, Urine 29946-1
Z2626 Alpha-1, Urine 29945-3
Z2627 Alpha-2, Urine 29947-9
Z2628 Urine Beta Globulin 53772-0
Z2629 Gamma, Urine 53773-8
Z2630 Free Urinary Kappa Light Chains 38176-4
Z2631 Free Urinary Kappa Excretion/Day 38177-2
Z2632 Free Urinary Lambda Light Chain 38178-0
Z2633 Free Urinary Lambda Excretion/Day 38169-9
Z2634 Free Urinary Kappa/Lambda Ratio 41759-2
Z2635 IFE Interpretation 13440-3