Table 4.

Categorization of ABO discrepancies in oncology patients.

Category	Frequency	Salient features
Type I	26% (25/96)	64% (16/25) were paediatric patients; majority aged <1 year old, indicative of delayed antibody development
Type II	28% (27/96)	52% (14/27) cases were diagnosed with acute leukaemia, indicative of the possibility of weakened antigens due to malignant disease
Type III	29% (28/96)	All cases were of rouleaux formation
Type IV	17% (16/96)	44% (7/16) - Bombay blood group 44% (7/16) - cold antibody cases 12% (2/16) - mixed (cold and warm) antibodies