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Updated: Apr 22, 2026
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Hydrogel Nanoparticle Harvesting of Plasma or Urine for Detecting Low Abundance Proteins
Published on: August 7, 2014
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Differences identified between serum and urine immunofixation electrophoresis.
Edward Tracy1, Dorinda M Andrews1, Mary A Constantin1
1Departments of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC, United States.
Clinica Chimica Acta; International Journal of Clinical Chemistry
|October 14, 2014
Summary
Serum and urine immunofixation electrophoresis (SIFE/UIFE) can show different patterns. Dithiothreitol treatment and free light chain assays help resolve complex multiple myeloma cases by clarifying monoclonal protein identification.
Area of Science:
- Clinical Chemistry
- Protein Electrophoresis
- Multiple Myeloma Diagnostics
Background:
- Serum immunofixation electrophoresis (SIFE) and urine immunofixation electrophoresis (UIFE) are crucial for diagnosing multiple myeloma.
- Discrepancies between SIFE and UIFE patterns can occur, necessitating further investigation.
Observation:
- A multiple myeloma case presented with inconsistent SIFE and UIFE results.
- SIFE detected 2 IgA λ and 1 IgM κ M-proteins, while UIFE showed monoclonal free λ light chains and a suspicious IgA κ protein.
Findings:
- Dithiothreitol treatment of the urine sample dissociated IgA molecules.
- Urine free light chain assay confirmed the presence of monoclonal IgA λ and a free κ light chain, resolving the discrepancy.
Implications:
- Immunofixation electrophoresis has limitations dependent on specimen type and protein structure (e.g., IgA disulfide bonds).
- Laboratorians must understand these limitations and utilize ancillary tests for accurate M-protein characterization in complex cases.
Keywords:
DifferencesMultiple myelomaSerum immunofixation electrophoresisUrine immunofixation electrophoresisMore Related Videos
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