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[Identification and genotyping of difficult blood groups in the patients with phymatosis].

In part of the patients with blood disease or malignant tumors, especially those with leukemia and multiple myeloma, the disease state and unsuitable treatment often resulted in the inconsistence between positive and negative ABO blood group, displaying attenuation of the antigen or antibody of ABO blood group. This study was purposed to analyze the course of inconsistence between positive and negative ABO blood group and to perform the correct typing of erythrocytes and genes. The serology, absorption and elution test were used to examine the 12 tumor patient of the inconsistence between positive and negative typing. The 6th, 7th exon and 5-7th introns were amplified by PCR for questionable samples, and the gene sequencing of exon was performed. The results showed that 9 specimens were determined as 6 of A group, 2 of O group, 1 of B group, 3 cases were identified as O46, B108, and A102 group, respectively, by the serology, absorption and elution typing. The genotype of 2 cases among them was not identified because of the erroneous PCR amplified result or the contradicted sequencing results, failing to determine the ABO genotype. It is concluded that the serological method for blood grouping, genotyping, absorption and elution method can be used for the blood samples unable to typing because of the inconsistence between positive and negative typing of ABO group, therefore, guaranteeing the safety and effectiveness.