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Blood transfusion is a therapeutic measure to restore the blood volume after extensive blood loss due to an accident or a medical procedure. Blood transfusion involves drawing a certain amount of blood from a suitable donor and infusing it into the recipient.
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Understanding an individual's blood group is a critical component of transfusion medicine. It ensures compatibility in blood transfusions, organ transplants, and even during pregnancy. Determining these blood groups involves the ABO and Rh blood typing systems, utilizing specific antigens and corresponding anti-sera to identify an individual's blood type.
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Identifying D-positive donors using a second automated testing platform.

M Goldman1, I Resz, J Cote

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|December 12, 2013
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Summary

Evaluating a second automated blood testing platform for D antigen detection revealed a very low yield in preventing alloimmunization in women under 50. This finding suggests current methods may suffice for most blood donors.

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Area of Science:

  • Transfusion Medicine
  • Immunohaematology
  • Blood Donor Screening

Background:

  • Variability in D antigen expression necessitates reliable methods for classifying blood donors with variant RHD alleles.
  • Current automated testing may be insufficient for accurate D antigen typing, potentially leading to alloimmunization risks.

Purpose of the Study:

  • To evaluate the efficacy of the Immucor Gamma Galileo automated platform in confirming D- results from the Beckman Coulter PK7300 system.
  • To estimate the number of alloimmunization cases preventable in women under 50 by implementing dual automated testing.

Main Methods:

  • Comparison of D antigen testing results between PK7300 and Galileo automated platforms for first-time blood donors.
  • Discordant samples were further analyzed using serologic tube methods, RHD genotyping (BLOODchip), and sequencing.
  • Estimation of alloimmunization prevention based on transfusion data and known alloimmunization rates.

Main Results:

  • Of 15,441 first-time donors with concordant D- results, five showed D+ on Galileo. One was a false positive; four had positive serologic tests and were C+.
  • Further RHD genotyping identified weak D types 67, 9, and two novel variants among the four discordant donors.
  • The addition of Galileo testing was estimated to prevent approximately one case of alloimmunization every 5-6 years in women under 50.

Conclusions:

  • Adding a second automated serologic testing platform (Galileo) shows a very low yield in preventing alloimmunization in the target population.
  • Current D antigen testing strategies appear adequate for most blood donors, with limited benefit from an additional automated platform for this specific outcome.