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What genetic analysis is used to determine that a person has down sydrome?
Wiki User
∙ 12y ago
Usually, you can have an amniocentesis done in utero to detect any abnormalities. After birth, they can look at physical features, and then do a genetic screening to find out of the child has the chromosomal abnormality found in people with Down syndrome.
For more, see what the Mayo Clinic has to say:
Diagnostic tests that can identify Down syndrome include: * Amniocentesis. A sample of the amniotic fluid surrounding the fetus is withdrawn through a needle inserted into the mother's uterus. This sample is then used to analyze the chromosomes of the fetus. Doctors usually perform this test after 15 weeks of gestation. The test carries a one in 200 risk of miscarriage. * Chorionic villus sampling (CVS). Cells taken from the mother's placenta can be used to analyze the fetal chromosomes. Typically performed between the ninth and 14th week of pregnancy, this test carries a one in 100 risk of miscarriage. * Percutaneous umbilical blood sampling (PUBS). Blood is taken from a vein in the umbilical cord and examined for chromosomal defects. Doctors generally perform this test after 18 weeks of gestation. This test carries a greater risk of miscarriage than does amniocentesis or chorionic villus sampling. Generally, this test is only done when speed of diagnosis is essential.
Wiki User
∙ 15y ago
Wiki User
∙ 12y agoThe vast majority of cases of Down Syndrome come from a genetic abnormality where their genome has an piece of chromosome number 21. Most humans have 23 pairs of chromosomes, but in the case of a person with Down Syndrome, they will most likely have an extra copy of part or all of one of their chromosome 21.
The primary genetic test technology that can detect this condition, known as trisomy, is called fluorescent in-situ hybridization, or FISH. Using FISH, fluorescent probes for chromosome 21 are used to tag a sample of a person's DNA (usually obtained from an amniocentesis) and a special microscope is used to detect if there are multiple copies of it.
Wiki User
∙ 10y agokaryotpe
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