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Radiology, Vol 148, 805-807, Copyright © 1983 by Radiological Society of North America

ARTICLES

The relationship of placental grade by ultrasound to markers of fetal lung maturity

MW Ragozzino, LM Hill, R Breckle, RD Ellefson and RC Smith

Seventy-two amniocenteses with concurrent placental grading by ultrasound were performed during 66 pregnancies. No relationship was observed between placental grade and the mean ratio of lecithin to sphingomyelin (L/S) or the phosphatidylglycerol concentration. Both placental grade and fetal lung maturity were interrelated by the independent variable of gestational age. The latter may explain the trend observed between a mature L/S ratio and the placental grade. Grade 3 placentas were present in only 20% of patients studied at 37 weeks of gestation or later (12 of 61 patients), and in every instance a Grade 3 placenta was associated with an absence of neonatal respiratory distress.




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