Methods for estimating the due date abstract accurate dating of pregnancy is important to improve outcomes and is a research and public health imperative as soon as data from the last menstrual period the first accurate ultrasound examination or both are obtained the gestational age and the estimated due date edd should be.
Determination of gestational age outcomes to determine whether ultrasound dating provides more accurate gestational age assessment than menstrual dating with or without the use of ultrasound to provide maternity health care ultrasound with a crownrump length equivalent to at least 7 weeks or 10 mm should be used to.
Once the fetal pole is seen the crownrump length crl of the embryo can be measured the crl is extremely accurate dr woo says later measurements that dont reflect the date given by an early crl means the pregnancy isnt.
accuracy of ultrasound to determine date of conception resolved question i would like to know the accuracy of ultrasounds in the first trimester would it be possible for them to be off 45 weeks ultrasound on 41 that dated me 7wks 0d with an edd of 1118 i had an ultrasound on 426 that dated me 11wks 2d crl 45mm with edd 1112.
An ultrasound showing a fetus measured to have a crownrump length of 167 cm and estimated to have a gestational age of 9 weeks and 2 days crownrump length crl is the measurement of the length of human embryos and fetuses from the top of the head crown to the bottom of the buttocks rump.