Establishing gestational age (GA) is critical for guiding obstetric care and decision-making (including the timing of prenatal visits, laboratory testing, administration of medications, vaccinations and delivery) as well as neonatal care (including need for newborn resuscitation and neonatal intensive care). Obstetric ultrasonography is the criterion-standard tool for establishing pregnancy viability and dating, as well as for assessing fetal anatomy, growth, and well-being. However, standard ultrasonography examination requires expensive equipment and skilled operators that are often not available in resource-limited settings.
