Related Experiment Videos
Pseudohypoproteinemia and multiple myeloma.
J H Avashia1, T D Walsh, R Valenzuela
1Department of Hematology, Cleveland Clinic Foundation, Ohio 44195.
Cleveland Clinic Journal of Medicine
|May 1, 1990
Summary
In multiple myeloma, M-protein gelification can falsely lower levels, impacting diagnosis and treatment. Proper sample handling, like vortexing, is crucial for accurate paraprotein measurement.
Area of Science:
- Clinical Chemistry
- Hematology
- Oncology
Background:
- Paraproteinemia, characterized by abnormal M-protein levels, is a key indicator in multiple myeloma diagnosis.
- M-protein levels are vital for assessing tumor burden and monitoring chemotherapy response.
Observation:
- A specific paraprotein (IgG1-kappa) exhibited reversible in vitro gelification.
- This gel formation was dependent on protein concentration and temperature, and reversed upon agitation.
Findings:
- Failure to vortex samples before measurement can lead to erroneously low M-protein levels and reduced serum viscosity.
- This artifact can result in understaging of multiple myeloma at diagnosis.
Implications:
- Inaccurate M-protein assessment can lead to inappropriate treatment response evaluation and premature chemotherapy cessation.
- Potential misdiagnosis of hyperviscosity syndrome carries significant clinical risks.