Two weeks later, the results of the patient&;s prenatal labs come back. Her blood type is A, with an antl D antibody titer of 1:4. What Is the most appropriate next step In the management of this patient?
Schedule an amniocentesis for amniotic fluid bilirubin at 16 weeks Repeat titer in 4 weeks Repeat titer in 28 weeks Schedule PUBS to determine fetal hematocrit at 20 weeks