Obstetric Ultrasound

1^st Trimester (10-14 weeks)

-          Viability

-          Dating scan (CRL)/ REDD (if diff > 7)

-          Gross anatomy – anencephaly, cystic hygroma, bladder outflow obstruction

-          Multiple pregnancy – chorionicity, amnionicity

2^nd Trimester (18-24 weeks)

-          Dating Scan (Biparietal diameter/ Head circumference)/ REDD (if diff >14)

-          Structural anatomy – brain, face, heart, kidneys, abdomen, spine, hands, feet, genitalia, bladder

-          Fetal growth – IUGR/PE/Oligo

-          Fetal Sex – 99% accuracy

-          Placental site – recheck @ 34 weeks

3^rd Trimester

-          EFW: FL, AC, BPD

-          Fetal Progression, well being, presenting part

-          Placenta Location (> 28 weeks)