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How do you screen for Down Syndrome?


Down syndrome is a chromosomal aberration, chromosome three is found in place of the normal two. Fetal genetic testing can detect Down's syndrome.

How do you screen for Down Syndrome?

Down syndrome is more common with increasing maternal age, and therefore requires the participation of genetic counselors over 37 years of age. Anyone who is suspected of having Down Syndrome (or other fetal developmental disorder) for some reason is advised to have a fetal chromosome test. This may be based on cells taken from fertility or amniotic fluid, with interventions of approximately. However, Down-screening can also be carried out with risk-free tests that accurately predict the presence of the disease. All she needs is maternal screening and genetic ultrasound.

Combined test

The combined test, between weeks 11 and 14 of pregnancy, preferably at week 12, is maternal blood and genetic ultrasound The ultrasound examines the size of the fetus (height, head, femur length, occipital thickness, nasal bone). With 90-95% security Fetal abnormalities can be found. Your results may be based on a low risk rating (below 1: 250), a negative test, while a high risk ratio (above 1: 250) is a positive test. In the latter case, further examinations may be required. A negative result does not exclude the presence of a given abnormality, but refers to its low incidence. -20. hetйben.

Test four

The test is carried out in the 2nd trimester, with a pregnancy of 16-19 weeks. Less reliable filtering from the combined test, 80 percent йrzйkenysйgы. Individual test kits are rarely recommended, especially if the combined test cannot be performed soon.

Sequential Filtration

Sequential screening was performed in the first trimester consists of a combined test and a second test in the second trimester. That is, first trimester and genetic ultrasound and second trimester. Provides accurate risk estimation, 95-97 percent hatйkonysбgъ.

Nifty tests

Non-invasive examination, that is, it does not endanger the fetus 99 percent йrzйkenysйgы. Maternal blood test, pregnancy 10-18. In addition to Down's Syndrome, Edwards and Patau Drain are screened for a total of 18 abnormalities a week. The Nifty test is a maternal blood test based on a fetal DNA test. This is the most up-to-date screening for Down Syndrome.

Triszуmia test

The Trismomia test, like the NIFTY test, is a non-invasive blood test, with accuracy similar to the Nifty test, but with less abnormality. Pregnancy 11-19. week. Down syndrome can be seen, Edwards and Pataukur and the gender of the baby can be determined.
  • Down syndrome: the mystery of chromosome 21
  • What is a combined test?
  • Chromosome aberrations: filter, filter, filter