A 29-year-old G2P1 at seven weeks’ gestation is referred to your tertiary center for consultation and prenatal care. Obstetric history is significant for fetal growth restriction (FGR) requiring preterm delivery at 33 weeks’ gestation. Her son’s birthweight was 1400 g. The patient’s prenatal care and delivery were at another center, and her medical chart is unavailable at the time of initial consultation.

A 34-year-old primigravida is referred by her primary care provider to your hospital center’s high-risk obstetrics unit after sonographic imaging confirmed viable intrauterine spontaneous monochorionic diamniotic (MCDA) twins with crown–rump lengths (CRL) of 47 mm and 44 mm, consistent for 12+4 weeks’ gestation by CRL of the larger twin. Twin A’s and twin B’s nuchal translucency (NT) measurements are 1.5 mm and 1.0 mm, respectively, with normal-appearing first-trimester fetal morphologies.

A new patient presents for consultation and transfer of care to your high-risk obstetrics unit at a tertiary center. She is a 34-year-old G4P2A1L2 at 14+3 weeks’ gestation with anti-c antibodies detected on routine testing; results have been confirmed at your hospital’s laboratory. All other prenatal investigations are unremarkable, including first-trimester sonogram and aneuploidy risk assessment.