The red blood cells used in the antibody screening test are usually two or three O-type red blood cells as a set of reagents. Each set of reagents screened red blood cells contains at least the following common antigens: D, C, E , c, e, M, N, S, s, P, Lea, Leb, K, k, Fya, Fyb, Jka, Jkb; laboratories with insufficient conditions may not have Lua, V, Cw, Kpa, Jsb antigen.