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  • Title: Biparietal diameter as a predictor of fetal lung maturity.
    Author: Newton ER, Cetrulo CL, Kosa DJ.
    Journal: J Reprod Med; 1983 Jul; 28(7):480-4. PubMed ID: 6887152.
    Abstract:
    A correlation has been established between fetal biparietal diameter (BPD), amniotic fluid lecithin/sphingomyelin (L/S) ratio and optical density at 650 nm (O.D. 650). We have noted that if the BPD is greater than 9.2 cm, the L/S ratio and O.D. 650 will be greater than 2.0 and 0.15, respectively, in 90% of cases. We reviewed the literature on the complication rate of third-trimester amniocentesis under ultrasonic guidance and concluded that in the absence of good dating, a reliably obtained BPD greater than 9.2 cm indicates fetal lung maturity in cases where amniotic fluid studies cannot be performed.
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