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However, the accuracy of the ultrasound examination is always dependent on the skill of the sonographer and the quality of the equipment.

Usually the expected date of delivery (EDD or EDC) is calculated from your last menstrual period - if the early dating scan calculates the EDD to be within 5 days of the EDD from your last menstrual period.

In addition to diagnostic uses, such as evaluating abnormalities in the abdomen, pelvis, and breast, ultrasounds are commonly used to guide needle and catheter placement in a variety of surgical If the doctor says not to add 2 weeks to the number estimated by the ultrasound, that means the number already includes the 2 weeks.

That means the number is the "number of week pregnant" the woman is, on the day of her ultrasound. Read more Us dating between 8-13 weeks is the most accurate to within /- 3-4 days. Read more Estimated due dates are just that - estimates.

(if the number did not already have the 2 weeks added on, then the number would be the "age of the fetus", which is 2 weeks less than the "number of weeks pregnant") ... Us dating is most accurate between 8 and 13 weeks using the crown rump length of the fetus. Making sure interval growth is appropriate at your doctor checkups and the fetal anatomy ultrasound is what we all want to see. Read more A due date, based on an Ultrsound in the second trimester can be off a week. It is possible the dating by last menses may be incorrect as well, especially if menses are variable. 1st trimester dating ultrasounds are based entirely on size measurements, regardless of lmp/ovulattion.

The EDD from the early dating scan is used - if the last menstrual period is not known or is unreliable, or the dating scan differs from the last menstrual period dating by more than 5 days.

As the baby gets bigger, it starts to express its individual growth potential.

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