- Definition of term pregnancy.
- Effects on the probability of conception, survival of the pregnancy, and sex of the baby.
- Clinical management guidelines for obstetricians-gynecologists.
- American College of Obstetrics and Gynecology.
Women's Health Care Physicians. Computer assisted analysis of fetal age in the third trimester using multiple fetal growth parameters. Accordingly, in creating recommendations and the associated summary table, single-point cutoffs were chosen based on expert review. Other biometric variables, such as additional long bones and the transverse cerebellar diameter, also can play a role.
- Fetal Imaging Workshop Invited Participants.
- Clinical management guidelines for obstetrician-gynecologists.
- Standardization of sonar cephalometry and gestational age.
- 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.
Comparison of pregnancy dating by last menstrual period, ultrasound scanning, and their combination. Ultrasonography dating in the second trimester typically is based on regression formulas that incorporate variables such as. Last menstrual period versus ultrasound for pregnancy dating. Ultrasonography in Pregnancy.
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This document reflects emerging clinical and scientific advances as of the date issued and is subject to change. Predicting delivery date by ultrasound and last menstrual period in early gestation. Ultrasound for fetal assessment in early pregnancy.
Chorionic gonadotropin secretion by human embryos in vitro. Time of implantation of the conceptus and loss of pregnancy. Methods for estimating the due date. Institute for Clinical systems Improvement. Mean sac diameter measurements are not recommended for estimating the due date.
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Prevention of Rh D alloimmunization. The American College of Obstetricians and Gynecologists. This Committee Opinion outlines a standardized approach to estimate gestational age and the anticipated due date. Accurate determination of gestational age can positively affect pregnancy outcomes.
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Timing of sexual intercourse in relation to ovulation. Method for estimating due date. Determination of Gestational Age by Ultrasound No. First- and second-trimester ultrasound assessment of gestational age.
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Management of Postterm Pregnancy. Estimation of gestational age by transvaginal sonographic measurement of greatest embryonic length in dated human embryos. Conclusion Accurate dating of pregnancy is important to improve outcomes and is a research and public health imperative.
Accurate dating of pregnancy is important to improve outcomes and is a research and public health imperative. American College of Obstetricians and Gynecologists. Daily immunoactive and bioactive human chorionic gonadotropin profiles in periimplantation urine samples. 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.
Antepartum fetal surveillance. Birth weight from pregnancies dated by ultrasonography in a multicultural British population. The information should not be construed as dictating an exclusive course of treatment or procedure to be followed. Ameri-can College of Obstetricians and Gynecologists.
Women s Health Care Physicians
Acta Obstet Gynecol Scand. Using a single ultrasound examination in the second trimester to assist in determining the gestational age enables simultaneous fetal anatomic evaluation. 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.