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The timing of certain tests, the monitoring of the baby's growth, and the correct diagnosis of premature labor, or being truly "overdue," (postdates), as well as many other situations that arise in the course of a typical pregnancy, all depend on a correct determination of the EDC for appropriate management.

In the past, the EDC was calculated by using Naegele's Rule, which determined the date by subtracting 3 months from the 1st day of the last period and then adding 7 days.

This is where our wonderful ultrasound machines can make a crucial difference.It can also be performed to confirm the results of a pregnancy test or just to provide you with some reassurance that all is progressing as it should be.At MUMS we are very proud of our professional experienced and caring staff who will ensure that you receive the best care possible and give advice and support where appropriate.The accuracy of the ultrasound estimate of the gestational age varies according to the gestational age. "Ultrasound measurement of the embryo or fetus in the first trimester (up to and including 13 6/7 weeks of gestation) is the most accurate method to establish or confirm gestational age" [24].