Apparent Depression of Antigens of the Kell Blood Group System Associated with Autoimmune Acquired Haemolytic Anaemia

Abstract. A case is reported of a young male patient who developed autoimmune haemolytic anaemia. During the acute phase, anti‐Kpb was detected in his serum and his antigens of the Kell system were markedly depressed. On remission, the antibody disappeared and the Kell antigens were normally expressed.