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Test Code MPU Monoclonal Protein Studies, 24 Hour, Urine


Shipping Instructions


Refrigerate specimen during collection and send refrigerated.



Necessary Information


24-Hour volume (in milliliters) is required.



Specimen Required


Supplies: Urine Container, 60 mL (T313)

Submission Container/Tube: Plastic, 60-mL urine bottle

Specimen Volume: 50 mL

Collection Instructions:

1. Collect urine for 24 hours.

2. Aliquot between 30 mL and 50 mL urine into plastic, 60-mL urine bottle.

Additional Information: See Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens for multiple collections.


Useful For

Monitoring patients with monoclonal gammopathies

Profile Information

Test ID Reporting Name Available Separately Always Performed
MPTU M-protein Mass-Fix, 24 HR, U No Yes
PEU Protein Electrophoresis, 24 Hr, U No Yes
PTU3 Protein, Total, 24 HR, U Yes, (Order PTU) Yes

Method Name

PTU: Turbidimetry

PEU: Agarose Gel Electrophoresis

MPTU: Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS)

Reporting Name

M-protein Studies, 24 HR, U

Specimen Type

Urine

Specimen Minimum Volume

30 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Urine Refrigerated (preferred) 14 days
  Frozen  5 days
  Ambient  24 hours

Reject Due To

  All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.

Clinical Information

Urine proteins can be grouped into 5 fractions by protein electrophoresis:

-Albumin

-Alpha-1

-Alpha-2

-Beta-globulin

-Gamma-globulin

One or more quantifiable monoclonal proteins may be present and reported as M spike.

 

The urine total protein concentration, the electrophoretic pattern, and the presence of a monoclonal immunoglobulin light chain may be characteristic of monoclonal gammopathies such as multiple myeloma, primary systemic amyloidosis, and light chain deposition disease.

 

The following algorithms are available:

-Amyloidosis: Laboratory Approach to Diagnosis 

-Multiple Myeloma: Laboratory Screening

Reference Values

PROTEIN, TOTAL:

<229 mg/24 hours

Reference values have not been established for patients <18 years of age.

 

ELECTROPHORESIS, PROTEIN:

The following fractions, if present, will be reported as mg/24 hours:

Albumin

Alpha-1 globulin

Alpha-2 globulin

Betaglobulin

Gamma globulin

 

MASS-FIX M-PROTEIN ISOTYPE:

M-protein Isotype MS:

No monoclonal protein detected

 

Flag M-protein Isotype MS:

Negative

Day(s) Performed

Monday through Friday

Report Available

4 to 6 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

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

CPT Code Information

84156

84166

0077U

Forms

If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.