Use of ultrasound to predict fetal lung maturity in 247 consecutive elective cesarean deliveries

Fetal lung maturity was assessed in 486 consecutive elective cesarean deliveries. Two hundred forty-seven cases met the ultrasound criterion of a biparietal diameter of 9.2 cm or a grade III placenta. All patients were screened for diabetes. There was one case of hyaline membrane disease. This approach thus reflects fetal lung maturity in 99.6% of patients.