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[Genotyping of RhD-negative blood samples diagnosed by serological tests from patients waiting for kidney
Shao-Jie Fu1, Yan-Lin Feng, Li-Xin Yu
1Department of Organ Transplantation, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China.
Objective:
To compare the accuracy of serological and molecular approaches to identification of RhD-negative patients waiting for kidney transplantation.
Methods:
A total of 103 RhD-negative blood samples by serological test were collected from patients waiting for kidney transplantation between January, 2006 and January, 2016. Quantitative PCR and sequencing were used to verify the results of RHD genotyping, and the false negative rates of the serological and molecular methods for RhD genotyping were compared.
Results:
Among the 103 blood samples, true RhD negativity (with all the 10 exons missing) was found in 56 samples (54.5%), and false RhD negativity (RhD positivity with loss, repetition, or missense mutation in the 10 exons) in 47 samples (45.6%). In the 47 false RhD-negative cases, weak D was detected in 1 case (2.1%), partial D in 13 cases (27.7%), and D-elution in 33 cases (70.2%). The detection rates of RhD negativity differed significantly between the serological and molecular methods (P<0.05).
Conclusion:
Serological test is associated with a high false negative rate in detecting RhD blood group, and the use of the molecular approach has important clinical significance in accurate RhD genotyping for patients waiting for renal transplantation.
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