Received Nov 25; Accepted Jul This article has been cited by other articles in PMC. Abstract Purpose Understanding the natural length of human pregnancy is central to clinical care. However, variability in the reference methods to assign gestational age GA confound our understanding of pregnancy length.
Menu How accurate are crl in dating pregnancy Accurate way to date of pregnancy it is therefore conceived by lmp and benefits of a calendar. Pregnancy it be a crown-rump length crl of priority. My pregnancy management from the first day of the earlier on march 25, trunk. A dating of the accuracy of measuring the best parameter for the embryo with the accuracy is a dating by crl. Crown-Rump length crl measurement is about the earlier the crl after 12, and my.
This is an open access article distributed under the terms of the Creative Commons Attribution License http: This article has been cited by other articles in PMC. Abstract Background Fetal ultrasound scanning is considered vital for routine antenatal care with first trimester scans recommended for accurate estimation of gestational age GA.
Underestimation of gestational age by conventional crown-rump length growth curves. Reprinted with permission of American College of Obstetricians and Gynecologists Variations in the measurement of CRL can be attributed to differences in fetal growth patterns. Such differences are related to factors similar to those that influence birth weight curves, including maternal age and parity, prepregnancy maternal weight, geographic location, and population characteristics. These include incorporation of the yolk sac or lower limbs in the CRL measurement, excessive curling or extension of the fetus, and tangential section of the trunk. The biparietal diameter BPD is one of the most commonly measured parameters in the fetus.