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Evaluation of cryoglobulins
U Kallemuchikkal1, P D Gorevic
1Department of Medicine, The Mount Sinai Medical Center, New York, NY 10029-6574, USA.
Archives of Pathology & Laboratory Medicine
|March 2, 1999
Summary
Cryoglobulin testing involves observing immunoglobulins that precipitate in cooled serum. Proper warm serum separation is crucial for accurate cryoglobulin screening and characterization.
Area of Science:
- Clinical Chemistry
- Immunology
- Hematology
Background:
- Cryoglobulins are immunoglobulins that precipitate upon cooling serum below core body temperature.
- Cryoglobulin screening is essential for diagnosing various conditions, but standardization remains a challenge.
Purpose of the Study:
- To describe the methodology of cryoglobulin screening and characterization.
- To highlight the critical importance of proper sample handling in cryoglobulin testing.
Main Methods:
- Cryoglobulin screening involves observing serum precipitation at low temperatures for up to 7 days.
- Characterization includes resolubilization tests, immunofixation, protein quantitation, and evaluation for specific biomarkers like rheumatoid factor and hepatitis C virus.
- Cryocrit measurement quantifies the precipitate volume percentage.
Main Results:
- The most significant factor affecting cryoglobulin test standardization is improper separation of warm serum from blood components.
- Accurate cryoglobulin identification requires a combination of precipitation observation, resolubilization, and immunochemical analysis.
Conclusions:
- Standardized cryoglobulin testing necessitates meticulous attention to sample handling, particularly warm serum separation.
- Proper methodology ensures reliable detection and characterization of cryoglobulins for clinical diagnosis.
