Dating by ultrasound
Ultrasound is not used to diagnose pregnancy, but is used to date a pregnancy and assess numerous health aspects of the fetus and mother.Your ultrasound(s) gives important information on many aspects of your pregnancy.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. These include: A dating ultrasound gives an accurate estimate of how far along you are in your pregnancy.Many women are uncertain of exactly when conception happened.During your dating scan your baby is carefully measured.
It won't hurt, although you may feel a little pressure on your tummy and from your full bladder.
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.
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.
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Pregnancy weeks are counted from the first day of your last menstrual period (LMP).