A fetus at 20 weeks' gestation is found on detailed anatomic ultrasound to have a structural cardiac anomaly. The parents have already had a normal cfDNA screen and ask whether any further testing is worthwhile. What is the most appropriate investigation?
According definition, fetuses are classified as having fetal growth restriction (FGR) when the ultrasound estimate of fetal weight or abdominal circumference falls below which percentile for gestational age?
The cell-free DNA (cfDNA / NIPT) detected in maternal blood for aneuploidy screening originates from placental apoptosis. What is the typical range of the fetal fraction?
