Ultrasound scans may be recommended at various stages of pregnancy for several reasons. Here are some examples.
- To confirm the pregnancy.
- To see if there is more than one baby.
- To establish the date when the baby is due (baby’s due date).
- To assess the risk of the baby being affected by certain chromosomal abnormalities, e.g. Down syndrome. To check on the physical development of the baby and to check that it is growing adequately.
- To rule out an ectopic pregnancy – a pregnancy that implants outside the uterus (womb).
- To check the amount of amniotic fluid surrounding the baby in the womb.
- To check the baby’s position before delivery.
- To determine the position of the placenta.
Ultrasound at different stages of Pregnancy
Before 12 weeks
An early pregnancy ultrasound will confirm that there is one fetus, that it is alive, the correct size, and in the correct position.
12-13 weeks
At this gestation, all the major organs and structures have been formed in the fetus making this a good time for the first detailed assessment of fetal anatomy. Some major structural abnormalities may be detected at this time.
20-22 weeks
This is the optimal time to detect fetal abnormality. Other issues such as placental site and growth will also be assessed. Generally, views of the baby are excellent, and this scan is enjoyed enormously by parents.
After 26 weeks
Ultrasounds performed after 26 weeks gestation are primarily to assess fetal growth and well-being. Fetal anatomy will be reviewed, however, in advanced gestation views are limited. Fetal limbs and/or the fetal head placed deeply in the pelvis can obscure fetal structure.
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