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Test Code IMFXO Immunofixation Only, Serum

Reporting Name

Immunofixation Only, S

Useful For

Identification of monoclonal immunoglobulin heavy and light chains

Documentation of complete response to therapy

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type


Specimen Required

Patient Preparation: Fasting


Preferred: Serum gel

Acceptable: Red top

Specimen Volume: 1 mL

Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Refrigerated (preferred) 28 days
  Ambient  14 days
  Frozen  14 days

Reference Values

No monoclonal protein detected

Day(s) and Time(s) Performed

Monday through Friday; 2 p.m.

Test Classification

This test has been cleared or approved by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
IMFXO Immunofixation Only, S 74665-1


Result ID Test Result Name Result LOINC Value
32436 Immunofixation 74665-1

Method Name



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