Bloodworks Northwest Laboratories

Immunohematology Reference Laboratory (IRL)

Group I Clinically significant antibodies	Group II Benign antibodies	Group III Clinically insignificant if not reactive at 37°C; possibly significant when reacting at 37°C	Group IV Antibodies that are sometimes clinically significant
ABO	Chido/Rodgers (Ch^a/Rg^a)	Lewis (Le^a/Le^b)	Yt^a
Rh (D, C, c, E, e)	Xg^a	M, N	Vel
Kell (K, k)	Bg	P₁	Ge
Duffy (Fy^a, Fy^b)	“HTLA”	Lutheran (Lu^a/Lu^b)	Gy^a
Kidd (Jk^a, Jk^b)	Cs^a	A₁	Hy
S, s	Kn^a		Sd^a
	McC^a, Yk^a
	JMH