“…Mixed ethnic population with considerable disparity of red blood cell antigens among blood donors and recipients exhibits a greater risk of alloimmunization in regular blood transfusion recipients (Alateeq et al., 2018; Alcantara et al., 2021). Literature shows several studies reporting the rate of ABO and RhD antigens in Saudi population (Abdullah, 2010; Alalshaikh et al., 2021; Alateeq et al., 2018; Alsuhaibani et al., 2015; Alzahrani et al., 2018; Saboor et al., 2020). Limited data of other most important antigens of the Rh blood group system including C, c, E and e and Kell blood group system, that is, K from Southwestern region of Saudi Arabia have been published (Alalshaikh et al., 2021; Halawani & Arjan, 2021); however, specifically no data are available from Samtah.…”