Accurate dating pregnancy ultrasound
However, in the early pregnancy, the developing embryo is very small (at 6 weeks gestation, the baby is only 5-9mm long) and a transvaginal ultrasound may be required to get a better image of the baby.Transvaginal ultrasound is safe and commonly performed during all stages of pregnancy, including the first trimester. Transabdominal ultrasound involves scanning through your lower abdomen.You will always have a choice about whether transvaginal ultrasound is performed.If you have concerns about transvaginal ultrasound, please discuss this with your sonographer before your ultrasound begins.Ultrasound uses high-frequency sound waves to create images of the inside of the body. It is safe, painless and relatively quick test that usually takes around 30 minutes.The technician will put a warm gel on your abdomen and use a scanning device to get the ultrasound images.
Ultrasound can tell you how many weeks pregnant you are, based on the size of your fetus.
If you are at high risk for fetal abnormalities, anatomic ultrasound can be performed during early pregnancy (11-16 weeks).
If the baby’s sex is determined during the ultrasound, you have the right to request this information.
Dating ultrasounds are most accurate when they happen between 7-12 weeks, and are calculated by measuring the fetus’ crown-rump length.
This generally predicts the expected date of birth within 5 days.
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A small amount of ultrasound gel is put on the skin of the lower abdomen, with the ultrasound probe then scanning through this gel.