Unexpected red cell antibodies in donors and patients at Siriraj Hospital.

The incidence of unexpected red cell antibodies in patients and donors at Siriraj Hospital were found to be 4.91% and 4.33% respectively. Anti Lewis, anti P1 and anti Mia were the most common antibodies detected. Antibodies of Rh system were the next, in which anti E was more common than anti D. Anti Jka, Jkb, Fyb, Dia, S and rare antibodies such as anti K, Ge1, Mta and H were also detected in this study.