Pregnancy dating criteria

The primary outcome measures were the rates of postterm pregnancies greater than 41 or 42 weeks’ gestation.

Secondary outcomes were the differences between the postterm and term gestations in maternal and neonatal outcomes.

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Early pregnancy is associated with numerous physiologic alterations - many of which are required to establish normal pregnancy outcome.

Three-dimensional ultrasound may provide new opportunities to better characterize some of these early changes.

Caughey, MD, Ph D, Department of Obstetrics and Gynecology, University of California, San Francisco, 505 Parnassus Avenue, Box 0132, San Francisco, CA 94143, O: 415-514-9322, P: 415-443-0301, F: 415-476-1811, E: We conducted a retrospective cohort study of all term, singleton pregnancies delivered at our institution who had an OBUS at ≤24 weeks of gestation.

Those women who underwent an OBUS at ≤12 weeks of gestation (OBUS12) were compared to those who had an OBUS at 13–24 weeks of gestation (OBUS13–24).

The accuracy of h CG measurement in determining the week since conception was more than 93%.

Methods for establishing pregnancy duration vary in their accuracy and their GA estimates.Summary statistics for GA using each reference method were determined (n = 131).Correlation between GA determined by ultrasound and ovulation day was excellent (maximum difference 10 days); however, pregnancies dated by ultrasound were 3 days advanced.Consequently, there has been considerable debate about the significance of this finding especially in asymptomatic women who undergo prenatal ultrasound examination for other reasons.This protocol will attempt to identify prognostic indicators of adverse pregnancy outcome.If a screening test shows that you have a higher chance of having a baby with Down's, Edwards' or Patau's syndromes, you will be offered diagnostic tests to find out for certain if your baby has the condition.