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Updated: May 10, 2025

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Studying the Integration of Adult-born Neurons
Published on: March 25, 2011
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Integrating RHD Genotyping for More Accurate Rh(D) Antigen Phenotyping: A Retrospective Study
Mohammad Barouqa1, Nestor Dela Cruz1
1Department of Pathology, University of South Alabama, Mobile, AL 36688, USA.
Medicina (Kaunas, Lithuania)
|April 26, 2025
Summary
RHD genotyping accurately classifies Rh(D) antigen status, reducing alloimmunization and optimizing blood use. This molecular testing improves patient safety and blood supply management in transfusion medicine.
Area of Science:
- Transfusion Medicine
- Genetics
- Immunology
Background:
- The Rh blood group system's polymorphism necessitates precise Rh(D) variant classification for transfusion safety.
- Conventional serologic testing faces challenges with weak and partial Rh(D) phenotypes.
- Accurate Rh(D) typing is crucial to prevent alloimmunization and ensure efficient blood utilization.
Purpose of the Study:
- To implement and evaluate the impact of RHD genotyping for Rh(D) antigen status classification.
- To improve the accuracy of Rh(D) phenotyping in transfusion medicine.
Main Methods:
- Retrospective study at University of South Alabama Medical Center and Children and Women's Hospital (2023-2024).
- ABO and Rh(D) typing on 12,994 patients; weak Rh(D) testing and RHD genotyping on individuals with discrepant results.
- Automated microplate direct agglutination for weak Rh(D) testing followed by molecular genotyping.
Main Results:
- Among 25 patients with weak/discrepant Rh(D) phenotypes, 52% showed weak Rh(D) variants (Weak Type 2 most common in pediatrics).
- Partial Rh(D) phenotypes identified in 40% of cases, predominantly in Black individuals.
- Three patients reclassified as Rh(D)-positive, receiving Rh(D)-positive RBCs without alloimmunization; four confirmed at risk and remained Rh(D)-negative.
Conclusions:
- RHD genotyping significantly enhances Rh(D) antigen classification accuracy, reducing alloimmunization risks and unnecessary Rh Immunoglobulin use.
- Molecular testing optimizes blood product utilization and alleviates pressure on Rh(D)-negative blood supplies.
- Integration of RHD genotyping into routine practice is essential for patient safety and resource management in transfusion medicine.
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