Sometimes, Doppler ultrasound may be used during a transvaginal ultrasound (TVS) for gynaecological reasons. The Doppler scan will take just a few minutes during your regular ultrasound. It gives a good idea of how your baby’s doing. This creates an image with blue or red highlights on a screen showing your doctor the speed and direction of the blood in real-time. Once your doctor locates a specific area or blood vessel that she wants to evaluate (one of the arteries in the umbilical cord, for instance), she presses a button to turn on the Doppler function. The transducer sends out sound waves, which bounce off the blood flow to your baby’s body via the cord as well as his blood circulation system. All modern ultrasound machines have a Doppler function.įor a transabdominal ultrasound, your doctor will spread gel on your belly and move a special wand, called a transducer, over your abdomen to find your baby.
You can have a Doppler scan at the same time as a normal scan, as it uses the same equipment. you have low amniotic fluid ( oligohydramnios).you have an existing medical condition, such as diabetes or high blood pressure.you’ve previously experienced a late miscarriage or suffered the loss of your baby at birth.you are experiencing fewer baby movements.your baby is smaller than expected for his gestational age and may have intrauterine growth restriction (IUGR).
When the colour Doppler option is used, the computer changes sound waves into different colours. This helps to show how well the placenta is working and whether your baby is getting all the oxygen and nutrients he needs. A regular ultrasound also uses sound waves, but it doesn't show blood flow.Ī Doppler scan will measure the blood flow through the umbilical cord and around different parts of your baby's body, such as his brain and heart. As blood cells move through vessels, they cause changes in sound waves. It uses high-frequency sound waves that bounce off moving red blood cells and, so, is helpful to check blood flow. If your baby needs to be born early, you'll need an induction of labour.Ī Doppler scan is a non-invasive ultrasound that assesses your baby’s growth and wellbeing and identifies any health concerns. If your scan shows a problem, you'll need extra scans. They are also used to investigate possible pregnancy complications and monitor high-risk pregnancies. Doppler scans are most often done in the third trimester, along with a growth scan. They help your doctor assess your baby's health and wellbeing.
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