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The information should not be construed as dictating an exclusive course of treatment or procedure to be followed. Use of this Web site constitutes acceptance of our Terms of Use. 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 []. Date changes for smaller discrepancies 10—14 days are appropriate based on how early in this second-trimester range the ultrasound examination was performed and on clinician assessment of LMP reliability. Copyright Routine Prenatal Care. Birth weight from pregnancies dated by ultrasonography in a multicultural British population.

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The measurement used for dating should be the mean of three discrete CRL measurements when possible and should be obtained in a true midsagittal plane, with the genital tubercle and fetal spine longitudinally in view and the maximum length from cranium to caudal rump measured as a straight line 8,

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Committee opinion no 611: method for estimating due date.

NumberNovember Obstet Gynecol ; 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 gestational age would, therefore, be at least 3 to 4 weeks at the time of a reliable hCG pregnancy test. Ultrasound Obstet Gynecol ; Standardization of sonar cephalometry and gestational age. Doppler Ultrasonography The fetal heart can be heard using Doppler ultrasound by 10 to 12 weeks in most patients [10].

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