Dating by ultrasound
However, some major problems can be seen at your dating scan, such as issues with the umbilical cord or with your baby's skull or abdominal wall. Fetal size and dating: charts recommended for clinical obstetric practice. In that case, you might need further tests, or a second scan to check the first scan's findings. The most accurate way to “date” your pregnancy is with an early ultrasound.The Society of Obstetricians and Gynaecologists of Canada recommends that all women have two ultrasounds: one “dating” ultrasound at 11-14 weeks and one “anatomic” ultrasound between 18-20 weeks.The number of fetuses, gestational age, and location of the placenta will be assessed.
Knowing where you are in your pregnancy is important for your prenatal care, all the way from your first trimester, through to labour.During your dating scan your baby is carefully measured. These measurements tell your healthcare provider how far along in your pregnancy you are. Conception usually occurs around 14 days after your LMP, which is when you ovulate. By then, the ultrasound technician, or sonographer, will be able to see your baby in more detail because he's bigger and his organs are more developed.