A. Rubella titer: Important for determining immunity to rubella, but not directly relevant during amniocentesis. B. Rh factor: If the mother is Rh-negative and fetal cells enter maternal circulation during amniocentesis, Rh immunoglobulin (RhoGAM) may be required to prevent isoimmunization. C. Н&Н: (Hemoglobin & Hematocrit) – These tests assess for anemia, which is relevant in pregnancy but not directly required before an amniocentesis. D. Blood type: Useful general information, but Rh factor specifically needs addressing due to the risk of sensitization.