Pregnancy dating, how accurate are dating scans?
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The American College of Obstetricians and Gynecologists, the American Institute of Ultrasound in Medicine, and the Society for Maternal—Fetal Medicine make the following recommendations speed dating catterick the method for estimating gestational age and due date:.
For the purposes of research and surveillance, the best obstetric estimate, rather than estimates based on the last menstrual period alone, should be used as the measure for gestational age.
Calculate estimated due date EDD and gestational age based on: 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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Conceptional age, menstrual age, and ultrasound age: Subsequent changes to the EDD should be reserved for rare circumstances, discussed with the patient, and documented clearly in the medical record. Log in or create a Choices account if you would like to save your due date.
Alternative therapies and fertility Can alternative therapies pregnancy dating you to conceive? N Engl J Med. 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.
The American College of Obstetricians and Gynecologists, the American Institute of Ultrasound in Medicine, and the Society for Maternal—Fetal Medicine recognize the advantages of a single dating paradigm dating used within and between institutions that provide obstetric care.
The body is not on a pregnancy counting down to delivery; natural variation will introduce uncertainty. Am J Obstet Gynecol.
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This method continues in the subsequent trimesters. Determination of Gestational Age by Ultrasound No.