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Cryoglobulin evaluation: best practice?

Ravishankar Sargur1, Peter White, William Egner

  • 1Clinical Immunology Unit, Department of Immunology, Northern General Hospital, Herries Road, Sheffield S5 8YD, UK. Ravishankar.Sargur@sth.nhs.uk

Annals of Clinical Biochemistry
|December 31, 2009
PubMed
Summary
This summary is machine-generated.

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Cryoglobulin testing is underutilized and lacks standardization, leading to missed diagnoses. Proper sample handling at 37°C is crucial for accurate cryoglobulin detection and patient care.

Area of Science:

  • Clinical Chemistry
  • Immunology
  • Laboratory Medicine

Background:

  • Cryoglobulins are immunoglobulins precipitating below 37°C, causing diverse symptoms like purpura, ischemia, and renal failure.
  • Cryoglobulin testing is underutilized due to perceived difficulties, long turnaround times, and improper sample handling.
  • Inconsistent methodologies and inadequate sample handling cause significant variability in cryoglobulin testing results.

Purpose of the Study:

  • To review the classification and clinical features of cryoglobulins.
  • To highlight the underutilization and challenges in cryoglobulin testing.
  • To propose best practice guidelines for laboratory detection and identification of cryoglobulins.

Main Methods:

  • Review of cryoglobulin classification and clinical manifestations.

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  • Critical appraisal of current cryoglobulin testing practices in European laboratories.
  • Analysis of factors contributing to variability and errors in cryoglobulin detection.

    • Main Results:

    • Cryoglobulin testing exhibits wide variability in practice across laboratories.
    • Improper sample handling, particularly temperature control, is a major source of false-negative results.
    • Significant intralaboratory and interlaboratory variability exists due to differing methodologies.

    Conclusions:

    • Standardization of cryoglobulin testing is essential to avoid missed diagnoses and improve result comparability.
    • Maintaining sample temperature at 37°C until serum separation is critical for accurate cryoglobulin detection.
    • Adoption of best practice guidelines can enhance the reliability of cryoglobulin laboratory evaluation.