Table of Contents
ISRN Hematology
Volume 2012 (2012), Article ID 358316, 6 pages
http://dx.doi.org/10.5402/2012/358316
Research Article

RhC Phenotyping, Adsorption/Elution Test, and SSP-PCR: The Combined Test for D-Elute Phenotype Screening in Thai RhD-Negative Blood Donors

1Graduate Program in Medical Technology, Faculty of Allied Health Sciences, Thammasat University, Rangsit Campus, Rangsit, Patumthani 12121, Thailand
2Division of Blood Bank, Department of Pathology, Phramongkutklao Hospital, Bangkok 10400, Thailand
3Division of Immunology, Department of Clinical Pathology, Army Institute of Pathology, Bangkok 10400, Thailand
4Department of Biochemistry, Phramongkutklao College of Medicine, Bangkok 10400, Thailand
5Department of Medical Technology, Faculty of Allied Health Sciences, Thammasat University, Rangsit Campus, Rangsit, Patumthani 12121, Thailand

Received 22 September 2012; Accepted 14 October 2012

Academic Editors: A. Pekrun and A. M. Will

Copyright © 2012 Songsak Srijinda et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The Rhesus (Rh) blood group is the most polymorphic human blood group and it is clinically significant in transfusion medicine. Especially, D antigen is the most important and highly immunogenic antigen. Due to anti-D, it is the cause of the hemolytic disease of the newborn and transfusion reaction. About 0.1%–0.5% of Asian people are RhD-negative, whereas in the Thai population, the RhD-negative blood type only occurs in 0.3%. Approximately 10%–30% of RhD-negative in Eastern Asian people actually were D-elute (DEL) phenotype, the very weak D antigen that cannot be detected by indirect antiglobulin test (IAT). There are many reports about anti-D immunization in RhD-negative recipients through the transfusion of red blood cells from individuals with DEL phenotype. D-elute phenotype screening in Thai RhD-negative blood donors was studied to distinguish true RhD-negative from DEL phenotype. A total of 254 Thai serologically RhD-negative blood donors were tested for RhCE phenotypes and anti-D adsorption/elution test. In addition, RhC(+) samples were tested for RHD 1227A allele by SSP-PCR technique. The RhD-negative phenotype samples consisted of 131 ccee, 4 ccEe, 1 ccEE, 101 Ccee, 16 CCee, and 1 CcEe. The 42 Ccee and 8 CCee phenotype samples were typed as DEL phenotype and 96% of DEL samples were positive for RHD 1227A allele. The incidence of RhC(+) was 46.4%, and 48 of the 118 RhC(+) samples were positive for both anti-D adsorption/elution test and SSP-PCR technique for RHD 1227A allele. The sensitivity and specificity were 96% and 100%, respectively, for RHD 1227A detection as compared with the adsorption/elution test. In conclusion, RhC(+) phenotype can combine with anti-D adsorption/elution test and RHD 1227A allele SSP-PCR technique for distinguishing true RhD-negative from DEL phenotype.