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See all in Video. You might also like You might also like. Ultrasound uses the size of the fetus to determine the gestational age the time elapsed since the the first day of the last menstrual period. The accuracy of the ultrasound estimate of the gestational age varies according to the gestational age.
The Society of Obstetricians and Gynaecologists of Canada recommends the earliest ultrasound with a crown rump length equivalent to at least 7 weeks or 10 mm should be used to determine the gestational age [28]. The American College of Obstetricians and Gynecologists recommends that ultrasound-established dates should take preference over menstrual dates when the discrepancy between ultrasound dating and LMP is.
Other Methods For Estimating the Gestational Age Clinical Examination A pelvic examination supported by good menstrual records in the first trimester has been reported to be a reliable method for dating of pregnancy [9].
Doppler Ultrasonography The fetal heart can be heard using Doppler ultrasound by 10 to 12 weeks in most patients [10]. The gestational age should ,therefore, be at least 10 to 12 weeks if fetal heart tone are heard. Human Chorionic Gonadotropin Pregnancy Test Human chorionic gonadotropin first becomes detectable in the mother's blood and urine between 6 and 14 days after fertilization 3 to 4 weeks gestational age [].
The gestational age would, therefore, be at least 3 to 4 weeks at the time of a reliable hCG pregnancy test. Twins When a twin pregnancy is the result of in vitro fertilization determination of gestational age should be made from the date of embryo transfer. Otherwise " The table below shows the average age of infants delivered in the United States according to the number of fetuses being carried plurality [29]. The earlier age at delivery of multiple gestations is a reflection of the increased incidence of preterm labor and obstetric intervention for complications such as preeclampsia, abruptio placentae, fetal growth restriction, and increased risk for stillbirth that occurs as the number of fetuses increases [].
The tendency for multiple gestations to be delivered earlier than singleton pregnancies should not be interpreted that multiples should be assigned an earlier estimated due date. Am J Obstet Gynecol ; PMID 2. PMID 3. PMID 4. Clinical management guidelines for obstetricians-gynecologists. Number 55, September replaces practice pattern number 6, October Management of Postterm Pregnancy.
Obstet Gynecol. PMID 5. JAMA ; PMID 6. Comparison of pregnancy dating by last menstrual period, ultrasound scanning, and their combination. Am J Obstet Gynecol. PMID 7. Birth weight from pregnancies dated by ultrasonography in a multicultural British population. Sep 4 ; PMID 8.
Ultrasonography in Pregnancy. American College of Obstetricians and Gynecologists. Conceptional age, menstrual age, and ultrasound age: a second-trimester comparison of pregnancies of known conception date with pregnancies dated from the last menstrual period. PMID: At each following prenatal care appointment, you'll be examined to determine the size of your uterus, and to monitor your little one's development. Along the way, depending on what is observed, your pregnancy due date may be adjusted.
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