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If you test for it in pregnancy the test is called a CVS or an Amniocentesis. They test the amniotic fluid or a piece of the babys' placenta for the third 21st chromosome.

After birth, they take some blood from the baby and run what is called a Karyotype. That test will count the chromosomes in the cells of the blood and if there are 3 21st chromosomes that means Down syndrome

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Q: How do you detect down syndrome?
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Related questions

What procedure can be preformed during fetal development to detect down syndrome?

amniocentesis


Will a laboratory test for Down syndrome pick up marijuana in your system?

If the test for this syndrome is a blood test then, maybe. A blood test will detect marijuana. A urine test will also detect marijuana.


What can karyotype analysis detect?

Karyotype analysis can be used to easily determine sex and a number of genetic disorders, such as Down's Syndrome (trisomy-21) or Klinefelter's Syndrome (XXY).


Can a congenital disorder be diagnosed by amniocentesis?

Amniocentesis primarily is looking at the DNA. It can detect major genetic problems like Down's syndrome.


How do you detect if you have down syndrome?

Autosomal means that it concerns an autosome--a chromosome other than a sex chromosome. Down syndrome is caused by an additional copy of the 21st chromosome. Since the 21st chromosome is not a sex chromosome, Down syndrome is autosomal.


What does the triple marker screen detect?

Triple-Marker tests for congenital defects such as Neural Tube defects (spina bifida, myelo/meningocelle), Edward's syndrome (Trisomy 18), and Down Syndrome (Trisomy 21).


How can amniocentesis detect a disorder like Down syndrome?

By using a very long needle to remove a small amount of the fluid that surrounds the developing baby.


What is the genetic disorder for having three 21 chromosomes?

down syndrome


Is there a test to detect angelman syndrome?

molecular genetic testing?


What is a chromosomal disorder that could result from nondisjunction?

Disorders, such as Down's Syndrome, are caused by nondisjunction.


What condition results when a child is born with an extra chromosome on the third pair?

Down syndrome


What is the correct spelling 'Down syndrome' or 'Down's syndrome'?

Down syndrome is generally the preferred spelling, although Down's syndrome is sometimes used in American sources.