A 32 primigravida came at 28 weeks having contraction. Her examination 3 weeks ago was pretty normal so as the baby too. You did a CTG.
What is the best test to be done to reveal the problem of the baby and give a clue about early intervention to save it?
a. Fetal blood sampling
b. Mother serum for Ig anti D titration
c. B HCG
d. Ultrasound
e. Amniocentesis