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Do you know what Screening Ultrasound is for?

With Screening Ultrasound you can know early, with an approximate detection rate of 80%, if the baby may be suffering from Down Syndrome.

The Screening Ultrasound It is the one that is performed on the pregnant woman around 3 months of pregnancy, specifically between weeks 11 and 14in order to evaluate the baby’s risk of suffering from chromosomal alterations, such as Trisomy 21 or Down Syndrome, Trisomy 13 and Trisomy 18.

He Screening It is one of the most important Ultrasounds performed during the Pregnancyalong with the Anatomical Detail Ultrasound from weeks 20 to 24. With this exam It is possible to know early, with an approximate detection rate of 80%, if the baby may be suffering from Down Syndrome.. Therefore, all pregnant women should have access to this exam regardless of the risk of pregnancy or the age of the mother.

What can be observed during the Screening Ultrasound?

This Ultrasound evaluates the size of the baby from head to toe and the gestational age is calculated in a very reliable way, the number of babies and the probable date of delivery. Likewise, the markers of chromosomal alterations, such as:

  • The thickness of the fluid on the back of the baby’s neck (Nuchal Translucency)
  • The blood speed that passes through a baby’s vein in the abdomen (Ductus Venosus)
  • The presence or absence of nasal bone
  • The competition of one of the heart valves (Tricuspid)

It is usual for babies with Dow syndromen show alterations in some of these markers. Additionally, The mother’s blood is evaluated in the uterine arteries through Doppler, to determine the risk of Preeclampsia (high blood pressure during pregnancy). And, depending on the position of the baby, in some cases the probability of fetal sex can be assessed.

How is the procedure performed?

Ultrasound is usually performed through the maternal abdomen, although in some cases the vaginal route is requiredlooking for the baby’s specific ultrasound markers previously reported, which suggest a high risk of Down Syndrome.

The completion time varies from 20 to 40 minutes, depending on the baby’s position and maternal characteristics which can vary from one woman to another. It is important to carry it out within the specific time, without exceeding 14 weeks, since we could not extrapolate the findings. ultrasound to risk probabilities of Down Syndrome, given the lack of tables for calculating risk above this time.