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The software has certain measurement scales based on data from large populations, and your baby’s measurements are put into this scale.

In other words, by comparing your baby’s measurements to the data from this large collection of measurements, the ultrasound can then tell how far along your baby is.

It is prudent to use the most evidenced-based methods available to accurately determine gestational age.

This article explores the accuracy of both menstrual and ultrasound dating techniques and discusses some of the issues and limitations for each method.

The fertilization age (also called embryonic age and later fetal age) is the time from the fertilization.

It usually occurs within a day of ovulation, which, in turn, occurs on average 14.6 days after the beginning of the preceding menstruation (LMP).

Medscape uses cookies to customize the site based on the information we collect at registration.As a general rule, the official gestational age should be based on the actual beginning of the last menstrual period, unless any of the above methods gives an estimated date that differs more than the variability for the method, in which case the difference cannot probably be explained by that variability alone.For example, if there is a gestational age based on the beginning of the last menstrual period of 9.0 weeks, and a first-trimester obstetric ultrasonography gives an estimated gestational age of 10.0 weeks (with a 2 SD variability of ±8% of the estimate thereby giving a variability of ±0.8 weeks), the difference of 1.0 weeks between the tests is larger than the 2 SD variability of the ultrasonography estimate, indicating that the gestational age estimated by ultrasonography should be used as the official gestational age.However, if you have a larger than average baby, the ultrasound will apply the husky figures to the “normal” measurements.This creates error in that the baby will compute out to be further along than he or she really is.When an ultrasound is performed, measurements of the head, abdomen, thigh, and amount of amniotic fluid are done.