<i>ABO</i> genotyping, ABH antigen status and <i>ABO</i> allelic expression.

In the ID column a F prefix denotes patients analyzed by flow cytometry [8] while a S prefix denotes loss of ABH antigen patients as detected by serology. ‘GENO’ refers to ABO genotype and ‘EXP’ to ABO allelic expression. For SEROLOGY ‘mfr’ refers to a mixed field reaction. In the EXP column, which allele is lost is shown in italics and underline. For patient F60 there were 2 samples analyzed for ABO mRNA expression, one in 1993 and one in 1996. The 1993 sample ('93+) was positive for ABO expression however the 1996 sample ('96–) which was when the flow analysis was performed, was negative for ABO mRNA expression. The bold indicates the samples with loss of ABH antigens. F25 was an A1A1 sample therefore determining allelic expression was not possible.