Hadlock FP, Deter RL, Harrist RB, Park SK. Reliability of ultrasound fetometry in estimating gestational age in the second trimester. Accuracy of ultrasound dating formulae in the late second-trimester in pregnancies conceived with in-vitro fertilization. Ultrasound dating at 12-14 or 15-20 weeks of gestation? A prospective cross-validation of established dating formulae in a population of in-vitro fertilized pregnancies randomized to early or late dating scan. Saltvedt S, Almström H, Kublickas M, Reilly M, Valentin L, Grunewald C. A prospective cross-validation of established dating formulae in in-vitro fertilized pregnancies. Ultrasound dating at 12-14 weeks of gestation. Sladkevicius P, Saltvedt S, Almström H, Kublickas M, Grunewald C, Valentin L. A Revised Formula Better Estimates Gestational Age From US Biometrics. The NICHD Fetal Growth Studies: Development of a contemporary formula for estimating gestational age from ultrasound fetal biometrics. First trimester ultrasound estimation of gestational age in pregnancies conceived after in vitro fertilization. Wu FS, Hwu YM, Lee RK, Li SH, Sun FJ, Lin MH, et al.
Determination of gestational age in twin pregnancy - Which fetal crown-rump length should be used?. 81(3):240-4.Ĭhaudhuri K, Su LL, Wong PC, Chan YH, Choolani MA, Chia D, et al. A comparison of transabdominal and transvaginal ultrasonography for determination of gestational age and clinical outcomes in women undergoing early medical abortion. Ultrasonic fetal measurements: new Australian standards for the new millennium. Certain dates may not provide a reliable estimate of gestational age. Birth weight from pregnancies dated by ultrasonography in a multicultural British population. 34(2):140-3.Ĭommittee Opinion No 700: Methods for Estimating the Due Date. The value of routine early pregnancy ultrasound in the antenatal booking clinic. Peek MJ, Devonald KJ, Beilby R, Ellwood D.
In rare cases, the date of coitus is known, and this may be useful in calculating the length of pregnancy.
In women who conceived following assisted reproduction techniques, the date of embryo transfer is known and may date the pregnancy accurately. The date of the first documented positive pregnancy test and the beta-human chorionic gonadotropin (bHCG) level may help ascertain the minimum gestational age. The date of feeling the first fetal movements (quickening) is far too unreliable to be useful. The first 2 are subject to considerable error and should only be used when ultrasonography facilities are not available. The 3 basic methods used to help estimate gestational age (GA) are menstrual history, clinical examination, and ultrasonography. such as serum screening, assessment of maturity, and induction of labor for postdate pregnancies. The estimation of pregnancy dates is important for the mother, who wants to know when to expect the birth of her baby, and for her health care providers, so they may choose the times at which to perform various screening tests and assessments,
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