New charts for ultrasound dating of pregnancy
All examinations were performed at three ultrasound centres that exclusively perform women’s health ultrasounds.
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Given all these charts showed inaccuracies in their ability to date these IVF pregnancies, we developed a new reference chart based on IVF dates in a singleton cohort.
We retrospectively obtained clinical details on 1268 singleton IVF pregnancies conceived using a fresh embryo transfer cycle, had a transvaginal first trimester ultrasound done between 6 ( 1d) to 9 ( 0d) weeks of gestation where CRL were measured, and progressed to viability (24 weeks of gestation).
In contrast, dates calculated from the first day of the last menstrual period (menstrual age) may have inaccuracies arising from imprecise recollection of dates, variation in the timing of ovulation, or time to conception.
A number of CRL reference charts have been proposed and different versions are in common use (Table 1).
Accurate determination of gestational age underpins good obstetric care.
We assessed the performance of six existing ultrasound reference charts to determine gestational age in 1268 singleton IVF pregnancies, where “true” gestational age could be precisely calculated from date of fertilisation.
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