Additional sample may be required if antibody identification testing is indicated. If additional testing is performed, additional charges/CPT code(s) may apply.
Antenatal RHIG is routinely given to Rh negative women at 26-28 weeks gestation. Antenatal specimens from women over 20 weeks gestation with trauma or vaginal bleeding will need an additional test (Fetal Screen) to determine if a large fetal-maternal hemorrhage has occurred. If this test is positive, a quantitative test is performed to determine the amount of RHIG that should be administered.