Almost 4 billion prescriptions for medications were written in the United States in 2010, an all-time high.
Each single dose prefilled syringe contains 300mcg (1500 IU) of Rho(D) immune globulin (human). This is the dose for the indications associated w/ pregnancy at or beyond 13 weeks unless there is clinical or laboratory evidence of a fetal-maternal hemorrhage (FMH) >15mL of Rh-positive RBCs. MICRhoGAM. Each single dose prefilled syringe of MICRhoGAM contains 50mcg (250 IU) of Rho(D) immune globulin (human).
If the mother is Rh negative and unsensitized then she receives RhoGAM if she has an Rh positive fetus, but she does not receive it if the infant is negative. She might have received antibodies as a fetus from her own mother if her mother was Rh positive, so she might already be sensitized before becoming pregnant herself.