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Related Experiment Videos

Sensitization and sensitivity: defining the unsensitized patient.

H M Gebel1, R A Bray

  • 1Department of Surgery, Louisiana State University Medical Center, Shreveport 73110, USA.

Transplantation
|May 8, 2000
PubMed
Summary

A more sensitive flow cytometry assay reveals that many patients considered non-sensitized by older methods are actually alloimmunized. This highlights the critical importance of accurate pretransplant antibody screening for successful organ transplantation.

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Area of Science:

  • Immunology
  • Transplantation Science
  • Clinical Chemistry

Background:

  • Pretransplant cross-matching is a standard procedure in HLA laboratories, mandated for selected solid organ transplants.
  • Recent studies suggest omitting final prospective cross-matches for non-sensitized individuals to reduce cold ischemia time and improve graft function.
  • Cytotoxicity-based antibody screening may underestimate patient sensitization compared to more sensitive flow cytometry assays.

Purpose of the Study:

  • To evaluate the sensitivity of different assays in detecting alloantibodies.
  • To determine the discrepancy in patient sensitization status between cytotoxicity-based and flow cytometry-based methods.
  • To assess the clinical implications of using less sensitive methods for identifying non-sensitized transplant candidates.

Main Methods:

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  • Panel-reactive antibody (PRA) testing was conducted on 527 patients awaiting renal or cardiac transplantation.
  • PRA evaluations utilized lymphocyte cytotoxicity (antiglobulin-enhanced, complement-dependent cytotoxicity [AHG-CDC]) and solid-phase assays (ELISA, flow cytometry).
  • Comparative analysis of assay sensitivity and concordance was performed on a subset of 88 patients.

Main Results:

  • Flow cytometry demonstrated higher sensitivity in detecting alloantibodies compared to AHG-CDC and ELISA.
  • Among 302 patients with 0% PRA by AHG-CDC, 76 (25%) had detectable antibodies via flow cytometry.
  • Retrospective crossmatches revealed positive results in 11 of 30 cardiac allograft recipients initially deemed non-sensitized by AHG-CDC.

Conclusions:

  • The method used to determine a patient's sensitization status is critical for transplant decisions.
  • AHG-CDC significantly underestimates sensitization, potentially leading to the transplantation of alloimmunized patients.
  • If foregoing a prospective crossmatch, transplant centers should utilize sensitive methods like flow cytometry for PRA assessment.