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Which fetal size standard should be used for diagnosing a small- or large-for-gestational-age fetus
The Fetal Medicine Foundation
Normal fetal growth is important not only for a healthy pregnancy, but also for ensuring health and well-being throughout childhood and adolescence. Learn more about the Study's findings. Depending on the ultrasound measurements included, the calculator can provide four estimates of EFW percentiles. Users should keep in mind that factors beyond those used to calculate EFW may affect an infant's birth weight. Definitions of the measurements used for the EFW calculator are available, as are ranges for the measurements spreadsheet linked below. After the Submit button is clicked, information for EFW will appear below it.
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NIH study finds racial, ethnic differences in fetal growth
BMUS published their first Working Party Report on fetal measurements in , at a time when the practice of obstetric ultrasound remained varied, with obstetric units having quite widely differing protocols for the number and timing of scans offered, as well as policies on re-dating pregnancy from ultrasound measurements. That report offered recommendations for the use of validated published tables and formulae for the commonly acquired fetal measurements used in dating and monitoring fetal growth. Since then, practice across England and Wales has become more uniform, particularly following the publication of the NICE guidance on antenatal care 1. BMUS accepted the need to review the old guidance, in order to ensure that the statistical validity of the original recommendations remained intact. That review, performed by Dr Lynn Chitty, Dr Trish Chudleigh and Dr Tony Evans, did bring some changes to recommendations,most particularly that dating after 13 weeks be based on head circumference measurement rather than bi-parietal diameter.
This should include at least two fetal measurements usually biparietal diameter BPD and femur length FL plus a consideration of additional parameters such as head circumference HC , occipitofrontal diameter OFD , abdominal circumference AC and humerus length HL. Measurements in the beam axis are more accurate than those made across the axis. Despite this, some measurements e. The earliest measurement of gestational age taken in pregnancy should usually be accepted as the definitive assessment, subsequent examinations reflecting only fetal growth in the intervening period.