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P reviously, assessment of the health of the human fetus has been restricted to physical examination of the pregnant uterus within the maternal abdomen, auscultation of the fetal heart, and maternal perception of fetal movement. Interest in fetal health was limited not only by available technology but also by the relative inability to alter the natural history of an abnormal pregnancy or to support a preterm infant. With improved surgical, anesthetic, and neonatal support techniques came increased sophistication in methods of fetal examination. The practice of obstetrics was revolutionized by the ability to use ultrasound to detect congenital anomalies and growth abnormalities during prenatal life; intrapartum monitoring

Doppler ultrasound studies of human fetal blood flow.