cordocentesis (Ans- used to identify fetal blood type and RBC when there is a risk of isoimmune hemolytic anemia. amniocentesis (Ans- used to determine lung maturity, detect congenital anomalies, and diagnose fetal hemolytic disease. Kleihauer-Betke Test (Ans- used to determine the amount of fetal blood in the maternal circulation when there is a risk of Rh-isoimmunization. postive contraction stress test needs what? (Ans- A positive contraction stress test indicates that further evaluation of the fetus is necessary. A biophysical profile will provide further evaluation with a real-time ultrasound. Adverse effect of combined oral contraceptives (Ans- common adverse effect of combined oral contraceptives. Other common adverse effects of the medication include amenorrhea, weight gain, headache, nausea, breakthrou