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Standardizing Leucocyte PNH clone detection: An international study.

Matthew Fletcher1, D Robert Sutherland, Liam Whitby

  • 1UK NEQAS for Leucocyte Immunophenotyping (UK NEQAS LI), Department of Haematology, Royal Hallamshire Hospital, Sheffield, UK.

Cytometry. Part B, Clinical Cytometry
|March 25, 2014
PubMed
Summary
This summary is machine-generated.

Standardized protocols improve the detection of Paroxysmal Nocturnal Hemoglobinuria (PNH) cells in blood tests. This approach reduces variability in results, enhancing diagnostic accuracy for PNH, a rare blood disorder.

Keywords:
EQAPNHQuality AssessmentQuality ControlStandardization

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Area of Science:

  • Clinical Laboratory Science
  • Hematology
  • Immunophenotyping

Background:

  • Recent guidelines emphasize high-sensitivity detection of glycophosphatidylinositol (GPI)-deficient cells in Paroxysmal Nocturnal Hemoglobinuria (PNH).
  • Accurate detection of PNH clones on Red Blood Cells (RBCs) and White Blood Cells (WBCs) is crucial for diagnosis and management.

Purpose of the Study:

  • To evaluate the performance of standardized protocols for PNH detection using stabilized samples.
  • To compare the variability of standardized methods versus in-house methods in experienced laboratories.

Main Methods:

  • UK NEQAS LI distributed stabilized samples with varying PNH cell percentages (0%, 0.1%, 8%) to 19 international laboratories.
  • Laboratories tested samples using both standardized and their own in-house protocols with provided reagents.
  • Results were analyzed for PNH clone detection rates and variability.

Main Results:

  • Standardized protocols showed no difference in PNH detection rates compared to in-house methods.
  • Standardized approaches resulted in significantly lower variability around the median PNH clone percentage.
  • For an 8% PNH population, the standardized method's interquartile range was 0.48% versus 1.29% for in-house methods.

Conclusions:

  • Stabilized whole blood samples are suitable for high-sensitivity PNH detection protocols and reagents.
  • Standardized protocols, coupled with carefully selected conjugates, reduce inter-laboratory variation in PNH testing.
  • The study underscores the importance of standardization for reliable PNH diagnostics.