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Summary

Creatinine levels were measured in 546 specimens of amniotic fluid with a lecithin/ sphingomyelin ratio of 2.5 or more. With amniotic fluid creatinine levels below the normal range, 3 of 6 infants had major congenital abnormalities and two had severe rhesus isoimmunization; 3 of the infants died. Of 514 cases with amniotic fluid creatinine levels within the normal range (mean±2 SD), 13 babies (2.5 per cent) had major congenital abnormalities but only one of the babies died, giving a perinatal mortality rate of 0.2 per cent. The significance of these findings is discussed.