This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Gynaecology & Obstetrics
In current obstetrics practice what is the best test for monitoring sensitized Rh negative mother? 
Select and explain. 
A. Biophysical profile, B. Middle cerebral aery Doppler wave forms, C. Fetal blood sampling, D. Amniotic fluid spectrophotometry
B: Middle cerebral aery Doppler wave forms
Answer: B: Middle cerebral aery Doppler wave forms 
Explanation: Best test for monitoring senstitized Rh negative mother isMiddle cerebral aery doppler wave forms Serial Doppler study of middle cerebral aery (MCA)-peak systolic velocity (PSV) is the mainstay to assess fetal anemia. A value >1.5 multiples of the median (MOMs) for the corresponding gestational age, predicts moderate to severe fetal anemia. This value (between 24 weeks and 35 weeks of gestation), is an indication for cordocentesis and fetal transfusion