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Related Experiment Videos

EDTA-dependent leukoagglutination.

C D Hillyer1, A N Knopf, E M Berkman

  • 1Department of Medicine, New England Medical Center Hospital, Tufts University School of Medicine, Boston, Massachusetts 02111.

American Journal of Clinical Pathology
|October 1, 1990
PubMed
Summary
This summary is machine-generated.

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A patient experienced falsely low white blood cell counts due to an EDTA-dependent IgM leukoagglutinin. This immune factor caused leukocyte clumping, leading to inaccurate automated cell counts in EDTA-treated blood samples.

Area of Science:

  • Hematology
  • Clinical Pathology
  • Immunology

Background:

  • Automated cell counters are crucial for blood analysis.
  • Accurate white blood cell (WBC) counts are vital for diagnosing infections and other conditions.
  • Sample collection anticoagulants, like EDTA, can sometimes interfere with cell counting.

Observation:

  • A patient sample collected in EDTA showed significantly low WBC counts (1.9 x 10(9)/L).
  • Peripheral blood smears revealed leukocyte aggregates.
  • WBC counts varied drastically depending on the anticoagulant used (heparin/citrate vs. EDTA).

Findings:

  • EDTA at concentrations >0.96 mg/mL caused >60% WBC reduction.
  • Patient serum dilutions (1:4) in PBS also reduced WBC counts by >50%.

Related Experiment Videos

  • Incubation at room temperature for 2 hours exacerbated WBC reduction (60%).
  • Dithiothreitol (DTT) treatment abolished the WBC-reducing effect, suggesting a protein-based interaction.

    • Implications:

    • The findings suggest the presence of an EDTA-dependent IgM leukoagglutinin.
    • This phenomenon can lead to pseudoleukopenia, misdiagnosing patients.
    • Awareness of EDTA-dependent agglutinins is crucial for accurate laboratory diagnostics.