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Test Code 9619 Immunoglobulin Total Light Chains, Urine

Additional Codes

Mayo Test ID
TLCU

Reporting Name

Immunoglobulin Total Light Chains,U

Useful For

Monitoring patients whose urines demonstrate large M-spikes

 

Confirming the quantitation of specimens that show M-spikes by electrophoresis

 

Detecting urine monoclonal proteins and identification of specimens that need urine protein electrophoresis

Profile Information

Test ID Reporting Name Available Separately Always Performed
KTLCU Kappa Total Light Chain, U No Yes
LTLCU Lambda Total Light Chain, U No Yes
KLTRU Kappa/Lambda TLC Ratio, U No Yes

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type

Urine


Specimen Required


If serum is being submitted on the same patient for FLCP / Immunoglobulin Free Light Chains, Serum; order that test under a different order.

 

Submit only 1 of the following specimens:

 

Specimen Type: Random urine

Container/Tube: Plastic, 10-mL urine tube (T068)

Specimen Volume: 1 mL

Collection Instructions: Collect a random urine specimen.

 

Specimen Type: 24-Hour urine

Container/Tube: Plastic, 10-mL urine tube (T068)

Specimen Volume: 1 mL

Collection Instructions: Collect urine for 24 hours.


Barnes-Jewish Hospital Note:
24-Hour Collection

Submit an entire 24-hour urine collection in a plain, brown urine container.
Additional Information:
1. Starting and ending times of collection are required.
2. Follow instructions for Urine Collection in Special Instructions.
3. Urine timed measurement is performed at an additional charge per 24-hour collection (CPT Code-81050).

 

Random Collection
See Specimen Required.


Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time
Urine Refrigerated (preferred) 7 days
  Frozen  20 days
  Ambient  72 hours

Reference Values

KAPPA TOTAL LIGHT CHAIN

<0.9 mg/dL

 

LAMBDA TOTAL LIGHT CHAIN

<0.7 mg/dL

 

KAPPA/LAMBDA RATIO

0.7-6.2

Day(s) and Time(s) Performed

Monday through Saturday; Continuously until 3 p.m.

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information

83883 x 2

LOINC Code Information

Test ID Test Order Name Order LOINC Value
TLCU Immunoglobulin Total Light Chains,U In Process

 

Result ID Test Result Name Result LOINC Value
KLTRU Kappa/Lambda TLC Ratio, U In Process
KTLCU Kappa Total Light Chain, U 27365-6
LTLCU Lambda Total Light Chain, U 27394-6

Method Name

Nephelometry

Urine Preservative Collection Options

Ambient

Yes <72 Hours

Refrigerated

Preferred

Frozen

Yes

6N HCl

No

50% Acetic Acid

No

Na2CO3

No

Toluene

No

6N HNO3

No

Boric Acid

No

Thymol

No

 

Forms

If not ordering electronically, complete, print, and send a Hematopathology/Cytogenetics Test Request Form (T726) with the specimen (http://www.mayomedicallaboratories.com/it-mmfiles/hematopathology-request-form.pdf)

Barnes-Jewish Hospital Additional Information:
For BJH Laboratory Use Only
Laboratory Processing Instructions:
BJH Chemistry will forward to the performing laboratory. Do not reject specimen if not received on ice.