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Obstetrics & Gynecology 1972;39:660-664
© 1972 by The American College of Obstetricians and Gynecologists
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L/S Ratio in Predicting Pulmonary Maturity in Utero

JOHN C. HOBBINS, MD, WILLIAM BROCK, LEON SPEROFF, MD, GERALD G. ANDERSON, MD, FACOG and BURTON CALDWELL

From the Department of Obstetrics and Gynecology, Yale University School of Medicine, New Haven, Conn 06510.

Abstract

Amniotic fluid L/S ratios were determined in 78 patients. No infant delivered within 48 hours after a mature ratio was recorded developed respiratory distress syndrome (RDS). Two of 8 babies born after the L/S ratio indicated immaturity developed RDS. Discrepancies between amnotic fluid creatinine and fetal weight were noted. The test was found to be very helpful in the management of high-risk pregnancies and in repeat cesarean sections.






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