Third Trimester Ultrasound

This scan is performed after the anatomy scan and usually in the third trimester. Reasons for the scan may include that your tummy is not measuring the size that is expected, that you may have developed gestational diabetes, the baby is not moving as much or you have gone over your estimated due date. The Sonographer will take measurements of the fetal head, abdomen and thigh bone to assess the growth of the fetus. The fluid around the fetus will be checked. The placenta will be assessed and in some instances, extra information of the blood flow to the fetus will be required. The Sonographer will then perform a Doppler assessment. On the day of the assessment, the Sonographer will explain as the assessment progresses.

Preparation: No preparation needed.

The Procedure: The Sonographer will ask you to lie on a table. Some gel will be spread on your bare lower abdomen and a transducer will be moved over your lower abdomen to produce images. It may be a bit uncomfortable at times when the Sonographer has to obtain the best images for the most accurate measurements. You will be able to watch these images on a specially mounted TV screen. The Sonographer will be able to show you details of what they are seeing on the monitor.

Scan duration: On average, an ultrasound scan takes approximately 30 minutes. A few factors that determine the length of the scan are; the position of the fetus in the uterus, how much fluid is present around the fetus, maternal size.

Post examination: The Radiologist will review the ultrasound images and provide a written report to your Midwife.

A paper print of the fetal face will be given to you if a clear image is obtained.