what is trisomy 23

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Dr. Liza H. Kunz answered:

What is trisomy 23? Whats the official name for it?

Klinefelter's

Klinefelters_syndrome
This link has some great information about Klinefelters: http://trisomydisorders.wordpress.com/2008/10/30/trisomy-23/
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Dr. Swati Avashia answered:

I'm a 36 year old woman pregnant with my first child. My first pregnancy ended in miscarriage - Trisomy 23. Should I get a CVS test?

Personal decision

Pregnant
CVS is helpful if you think you would want end the pregnancy in the first trimester based on the results and for genetic counseling for future pregnancies. If you don't think you would end the pregnancy, you may want to consider waiting until your second trimester to get an amniocentesis, it is lower risk and will still give you the genetic information you are looking for.
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What is trisomy?

Error in formation

Trisomy
Humans have 23 pairs of chromosomes or 46 total. During the formation of the egg, each pair splits and one of each travels to the egg. At conception, the sperm brings one of each & the new embryo now has 23 pairs (two of each). Any time one of the chromosome pairs doesn't split & gives a pair to the egg, a third will come from the sperm and a trisomy of that chromosome is formed.
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What is trisomy 13?

Chromosome error

Sperm
Humans have 23 pairs of chromosomes(C) making up our DNA.When the egg or sperm form, the (C) pairs are supposed to split up with 1 (C) of each pair going to the egg or sperm.If the 13 (C) does not split & both go into an egg, fertilization will add a 3rd from dad & a trisomy 13 will begin to form. The imbalanced (C) causes malformations, miscarriage or early death.
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What is Trisomy 22?

Trisomy 22

Trisomy_
Trisomy is a big word that really only means three copies. Trisomy 22 means three copies of chromosome 22. Trisomy 22 causes many spontaneous pregnancy losses. If a fetus has trisomy 22 it rarely survives into the second or third trimester. If born alive, the newborn usually dies.
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Dr. Jane Van Dis answered:

Can radiation cause trisomy 13?

Not to my knowledge

Radioactive
Trisomy is caused by a Robertsonian translocation in the karyotype of one of the parents or by a meiotic nondisjunction event of a sperm or egg cell. 88% of time Trisomy comes from nondisjunction in the maternal egg and 8% comes from nondisjunction in the paternal sperm
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Now is a partial trisomy formed?

Partial trisomy

"Partial" trisomy refers to only having an extra copy of part of the chromosome, not the entire chromosome as is the case in full trisomies. The extra piece is usually inserted into or attached to another chromosome. Hope that helps
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whats abnormal facies in trisomy?

Abnormal facies

Trisomy_
The term "abnormal facies" refers to unusually facial features. What unusual facial features present will depend upon which trisomy is present.
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What're the causes of trisomy 18?

Error in formation

Trisomy
During the formation of the egg or sperm, the chromosome(C) pairs split with one of each going to the egg or sperm. At conception, the egg & sperm each bring 1 of each (C) & the embryo starts with a pair of each.If there is an error & the 18pair doesn't split but donates a pair of 18's to the egg,then it picks up a 3rd from the sperm. Age/toxins/radiation etc all may play a role in (C) errors.
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Dr. Danae Steele answered:

What is patau syndrome, a trisomy?

Trisomy 13

Patau_syndrome
Patau syndrome is also called Trisomy 13. It occurs when a baby has 3 copies of the number 13 chromosome instead of the usual 2 copies. It causes severe physical problems and most babies with Trisomy 13 die before birth or within the first year after birth. It usually happens because of an accident which occurs when the egg is fertilized, and occurs more commonly as mothers get older.
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