Ultrasound dating accuracy second trimester

ultrasound dating accuracy second trimester

Abstract Objective To compare the dates of delivery predicted by last menstrual period LMPcrown—rump length CRL and biparietal diameter BPD with the actual date of delivery in a population of pregnant women divided into those with certain and those with uncertain LMP. Table 1 provides guidelines for estimating the due date based on ultrasonography and the LMP in pregnancy, and provides single-point cutoffs and ranges based on available evidence and expert opinion. In our material the mean induction-rate was We analyzed the precision with respect to the gestational week at ultrasound examination for the whole time span 7—22 completed weeks covered by the study. J Clin Ultrasound ; In a sub-optimally dated pregnancy, a repeat low transverse cesarean delivery, if desired by the patient, should be performed at 39 weeks based on the best estimate of gestational age [1]. Various studies have sought a more accurate method of dating pregnancy.

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This information is vital for timing of appropriate obstetric care; scheduling and interpretation of certain antepartum tests; determining the appropriateness of fetal growth; and designing interventions to prevent preterm births, postterm births, and related morbidities.

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Ultrasound Accuracy for Predicting Due Dates

Ultrasounds performed after 22 weeks gestation cannot be used to estimate the due date of the baby because the size no longer reflects the age very well. Because decisions to change the EDD significantly affect pregnancy management, their implications should be discussed with patients and recorded in the medical record. Share full text access.

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