Dating a pregnancy without a period

However, once a fetus is delivered, it is no longer at risk of intrauterine fetal demise, and use of this denominator has traditionally underestimated the risk of stillbirth.

The appropriate denominator is not all deliveries at a given gestational age, but ongoing (undelivered) pregnancies.

Thus, not only the LMP date, but the regularity and length of cycles must be taken into account when estimating gestational age.Although the last menstrual period (LMP) has been traditionally used to calculate the estimated due date (EDD), many inaccuracies exist using this method in women who have irregular cycles, have been on recent hormonal birth control, or who have first trimester bleeding.In particular, women are more likely to be oligo-ovulatory than polyovulatory, so cycles longer than 28 days are not uncommonly seen.For example, in one study, the rates of meconium and neonatal acidemia both increased throughout term pregnancies beyond 38 weeks of gestation.In addition to stillbirth being increased prior to 42 weeks of gestation, one study found that the risk of neonatal mortality also increases beyond 41 weeks of gestation.

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