Most sensitive test for assessment of fetal well being is

(Biparietal diameter) (85-Dutta 6th)Real ultrasound measurement of fetal growth* First trimester - Crown - rump length* Second trimester - Biparietal diameter (BPD)* Third trimester - Multiple foetal growth parameters are considered together. These are- Prior to 36 weeks - Combination of biparietal diameter, abdominal circumference and femur length (FL)- After 36 weeks - Combination of head circumference, abdominal circumference and femur lengthA- BPD greater than 9.2 cm indicates foetal pulmonary maturity corroborated by L:S ratio* Early measurement of BPD and FL are the most useful in establishing gestational age Later measurement of fetal growth are best achieved by measurement of the head circumference and the abdominal circumference (G. chamberlain 7th)* Foetal head: abdominal circumference ratioMaximum - 1.29 at 12 weeksEqual - 1.00 at 36 weeksMinimum - <1.00 after 37 weeks* Bishop score is used for induction of labour* Manning score is most sensitive & reliable test for fetal well beingDifferent diameter of skull in newborn are* Suboccipito-bregmatic =9.5cm* Suboccipito-frontal =10cm* Occipito frontal =11.5cm* Mento vertical =14cm* Sub mento vertical =11.5cm* Sub mento-bregmatic =9.5cm* Biparietal diameter =9.5cm* Super-subparietal =8.5cm* Bitemporal diameter =8cm* Bimastoid diameter =7.5cm* Twin peak sign - Ultrasonography shows extension of placental tissue into the inner twin membrane in diaminiotic dichorionic (DD)