The Early Gestation Scan. Embryonic/fetal growth 1 st trimester. Crown rump length best index of gestational length Phase of most rapid growth in length (up to first ½ preg.) Time when growth influenced most by genome aneuploidy external influences infection drugs
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external influences infection
Stage being set for later effects smoking
earlier detection of multiple pregnancies
twins undiagnosed at 26 weeks OR 0.08, 95% C I 0.04 to 0.16
post-term pregnancy O R 0.61, 95% C I 0.52 to 0.72
No differences detected for substantive clinical outcomes
perinatal mortality O R 0.86, 95% C I 0.67 to 1.12
Where detection of fetal abnormality was a specific aim
number of terminations of pregnancy for fetal anomaly increased.
Two vertical measurements same diameter, therefore, 2 horizontal and 1 vertical added and divided by 3 to give MSD
(high incidence of antenatally acquired cerebral lesions)
ii) delivery - “viability”
U/S for prediction diagnosis and management