Since its introduction in the 1950s, ultrasonography in pregnancy has
been helpful in determining gestational age, detecting multiple pregna
ncies, locating placentas, diagnosing fetal anomalies, evaluating feta
l well-being, and guiding obstetricians with in utero treatment. We re
view current standards and controversies regarding the indications, sa
fety, accuracy, and limitations of ultrasonography in pregnancy.