THE INVESTIGATION AND MANAGEMENT OF THE SMALL-FOR-GESTATIONAL-AGE FETUS 1

SGA fetuses are a heterogeneous group comprising fetuses that have failed to achieve their growth potential (fetal growth restriction, FGR) and fetuses that are constitutionally small. Approximately 50–70% of fetuses with a birthweight below tenth centile for gestational age are constitutionally small, and the lower the centile for defining SGA, the higher the likelihood of FGR. On the other hand, a fetus with growth restriction may not be SGA.