What is an obstetric ultrasound?

An obstetric ultrasound is used to assess the wellbeing of your pregnancy during the first, second and third trimester.

A (dating scan) <12 week ultrasound assesses the uterus (womb) for a pregnancy and depending on the stage of the pregnancy can confirm an estimated due date.

A 12-13 week ultrasound (also known as a Nuchal Translucency ultrasound) is an early anatomy scan whereby the fetal anatomy and growth is assessed.

A 20-22 week ultrasound is part of the routine care during pregnancy. Screening is carried out at this stage in the pregnancy because the fetus is big enough for its anatomy, head to toe, to be assessed.

A >22-week ultrasound typically monitors the fetus’ growth as well as assesses the cervix (part of the birth canal) and the position of the placenta (the organ the supplied nutrients and oxygen to the fetus).

How do I prepare for an obstetric ultrasound?

There is different preparation required for an obstetric ultrasound depending on the stage of your pregnancy. Contact us so we can provide the necessary preparation for your ultrasound.

What happens during an obstetric ultrasound?

You are asked to lie on an examination bed. The lower abdomen is exposed and a gel is applied to the skin. A transducer is moved gently across the abdomen.

The experience of seeing your unborn baby is exciting, and the sonographer will point out easily recognized parts of the body. You might not recognize or understand some of the images on the ultrasound screen, but is it all part of this important and thorough screening.

The ultrasound is carried out for medical reasons to full assess the development of the fetus.

If it is necessary to check the position of the placenta more clearly, then a transvaginal ultrasound might be carried out. In a transvaginal ultrasound, a transducer will be inserted into the vaginal canal. If a transvaginal ultrasound is required, the procedure will be fully explained and your permission requested.

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