Amniocentesis for Fetal Lung Maturity in Women With Suboptimally Dated Pregnancies Historically, amniocentesis has been used to assess fetal lung maturity before the planned delivery of a fetus lacking an accurate gestational age determination in order to mitigate the risks of unintentionally delivering a fetus at an earlier-than-expected gestational age August The College and SMFM are working with other expert groups to establish evidence-based consensus on criteria for determining gestational age. References World Health Organization. First trimester: American College of Obstetricians and Gynecologists. Underestimation of gestational age by conventional crown—rump length dating curves. Late-term delivery is indicated at 41 weeks of gestation when gestational age is uncertain, using the best clinical estimate of gestational age. Historically, dating pregnancies and calculating due dates were left to weekly pregnancy calendars. Given concern that a full-term or late-term suboptimally dated pregnancy could actually be weeks further along than it is believed to be 16 , late-term delivery is indicated at 41 weeks of gestation when gestational age is uncertain, using the best clinical estimate of gestational age.













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