Quick Review Cards for Medical Laboratory Science

Breaking the Rh Code Immunohematology Review 449

SEE THINK EXAMPLE(S)

r before h “big” rh’ = C

h before r “little” hr’ = c

R presence of D Rh 1 = DCe

r absence of D rh’ = dCe

1 or ’ C Rh 1 = DCe

(if no 1 or ’, then c) rh’ = dCe

Rh 0 = Dce

2 or ” E Rh 2 = DcE

(if no 2 or ”, then e) rh” = dcE

Rh 0 = Dce

0 c + e Rh 0 = Dce

Z or y C + E rhy= dCE

Notes: Italics & superscripts denote genes, e.g., Rh’.
Standard type is used for agglutinogens (antigens).
Subscripts are used with R, e.g., Rho.
Superscripts are used with r, e.g., rh’.
The h’s are left out in shorthand notation, e.g., Rho = Ro.