Fp meaning bpd12/21/2023 Menstrual age from fetal measurements were evaluatedīy physicians, and routine measurements includedīPD, HC, AC, and FL. Our previously published equations for predicting Period (LMP), and patients with multiple gestation,įetal demise, or evidence of gross physical or chromosomal abnormality were eliminated from the study. All patients had certain dates by last menstrual The population wasĪ predominantly middle-class Caucasian group seekingĪmniocentesis primarily because of advanced maternalĪge. This period, 1,770 chromosomally normal singletonįetuses between 14 and 21 weeks of fetal development Technical success of the procedure is maximal. Pelvic examination or first trimester sonogram to confirm dates so that the amniocentesis can be scheduledīetween 16 and 18 weeks this time frame is chosenīecause it is thought to be the one at which the InĪddition, these patients generally have had an early Genetic amniocentesis in our institution usually do soīetween week 14 and 20 of fetal development. Was chosen for review because patients undergoing Genetic amniocentesis data from our institution over HOW ACCURATE IS SECOND TRIMESTER FETAL DATING © 1991 by the American Institute of Ultrasound in Medicine Has any advantage over single dating parameters in the Parameters as predictors of age in early second trimester, (2) to compare the accuracy to more recent equations derived specifically for use during this time frame,Īnd (3) to determine if the use of multiple parameters To evaluate our previous equations using individual The purposes of the present study, therefore, are (1) Trimester use, whereas the Hadlock models are recommended for use throughout the second and third These authorsĬoncluded that second trimester fetal dating should beĭone using models developed specifically for middle Second trimester using these models is quite good, withĪ 953 confidence interval of ☑ week. Studies were developed for use prior to the third trimester of pregnancy, and the reported accuracy in the More recently, Perrson and Weidner and RossavikĪnd Fishbume4 have developed single- and multipleparameter equations for fetal age prediction from infertility patients with known dates of conception. Which fetal dating usually takes place in clinical practice. Have not been adequately tested in a separate data setįor early second trimester pregnancies, the point at Widely used in a number of ultrasound laboratories, We conclude that these models, developed for dating between 14 and 42 weeks of fetalĭevelopment, provide highly accurate estimates of fetalĪge in the second trimester of pregnancy. Statistically significant improvement in prediction ofĪge, in terms of both random error and maximum The use of multipl e-parameter models results in Hadlock:ĭepartment of Radiology, 1 Baylor Plaza, Baylor College of Medicine,įrame. Supported in part by a grant from The Woman's Hospital of TexasĪddress correspondence and reprint reque ts to Dr. Revised manuscript accepted for publication April 10, 1991 University of Oklahoma Medical School, Oklahoma City, Oklahoma. Texas, and the tDepartment of Obstetrics and Gynecology. Of Biometry, University of Texa&School of Public Health, Houston, Observed in the original study.2 These equations, nowīaylor College of Medicine, Houston, Texas, and the t Department Hispanic population at 20 to 40 weeks of fetal development and this latter study confirmed the accuracy Subsequently tested prospectively in a mixed black and In a middle-class Caucasian population, but it was This initial study was based on 361 normal pregnancies Menstrual age in patients with certain menstrual dates. 1 Their investigation evaluated the use ofīiparietal diameter (BPD), head circumference (HC),Ībdominal circumference (AC), and femur length (FL),īoth individually and in combination, as predictors of Of equations derived from single and multiple parameters for predicting menstrual age from ultrasound studies done between 14 and 42 weeks of fetalĭevelopment. N 1984, Hadlock and coworkers published a series Results of recently published dating models from otherĬenters designed specifically for use during this time The 95% confidence interval using measurements of the fetal head and femur individually wasĪpproximately ☑ week, which is comparable to the In the second trimester (14 to 21 weeks of fetal development). Single and multiple parameters were tested retrospectively in 1770 chromosomally normal singleton fetuses In this study, the Hadlock models for fetal dating using
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