Read terms. Pettker, MD; James D. Goldberg, MD; and Yasser Y. This document reflects emerging clinical and scientific advances as of the date issued and is subject to change. The information should not be construed as dictating an exclusive course of treatment or procedure to be followed. As soon as data from the last menstrual period, the first accurate ultrasound examination, or both are obtained, the gestational age and the estimated due date EDD should be determined, discussed with the patient, and documented clearly in the medical record. Subsequent changes to the EDD should be reserved for rare circumstances, discussed with the patient, and documented clearly in the medical record. When determined from the methods outlined in this document for estimating the due date, gestational age at delivery represents the best obstetric estimate for the purpose of clinical care and should be recorded on the birth certificate. 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. For instance, the EDD for a pregnancy that resulted from in vitro fertilization should be assigned using the age of the embryo and the date of transfer. As soon as data from the last menstrual period LMP , the first accurate ultrasound examination, or both are obtained, the gestational age and the EDD should be determined, discussed with the patient, and documented clearly in the medical record. For the purposes of research and surveillance, the best obstetric estimate, rather than estimates based on the LMP alone, should be used as the measure for gestational age. An accurately assigned EDD early in prenatal care is among the most important results of evaluation and history taking. 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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How big will my baby fetal dating scan at 12 weeks? Can I have prenatal screening at the same time? Are there any disadvantages to having a scan? Journal of Obstetrics and Gynaecology Canada 1;39 9 : — Butt K, Lim K. Determination of Gestational Age by Ultrasound. Journal of Obstetrics and Gynaecology Canada 36, 2: — Cargill YM, Morin L.
Journal of Obstetrics and Gynaecology Canada 39 8 : e - e Journal of Obstetrics and Gynaecology Canada 39 9 : e - e Safer fetal dating scan test for pregnant women. Department of Health. Implementation of maternal blood cell-free DNA testing in early screening for aneuploidies. Ultrasound Obstet Gynecol. Fetal Ultrasound. Health Link British Columbia. Fetal size and dating: charts recommended for clinical obstetric practice.
Ultrasound ; 17 3 : —7. Non-invasive prenatal testing. Addition of non-invasive test to improve screening for pregnant women. Blog, PHE screening. Public Health England. Ultrasound scans. Evaluation of gestation emedicine. Journal of Obstetrics check this out Gynaecology Canada 38 10 : — Newson L. Pregnancy — screening tests. Health Information.
The pregnancy dating scan. Ultrasound scans in pregnancy. Your guide to screening tests during pregnancy. Antenatal care for uncomplicated pregnancies. Updated January National Institute for Health and Care Excellence. Multiple pregnancy: antenatal care for twin and triplet pregnancies CG Ectopic pregnancy and miscarriage: diagnosis and initial management CG Antenatal care www. Screening tests for you and your baby.
Updated February Introduction to antenatal screening tests. Your choices in pregnancy. The NICHD fetal growth studies: development of a contemporary formula for estimating gestational age from ultrasound fetal biometrics. Am J Obs Gynecol ; 1 : S Nuchal translucency scan. Obstetric Ultrasound Biological Effects and Safety. Journal of Obstetrics and Gynaecology Canada. Show references Hide references. Enter your due date or child's birthday mm Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec dd 1 2 fetal dating scan 4 5 6 7 8 scxn 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 yyyy Trying to conceive?
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