Friday, July 18, 2008

Strange things happen

After the disappointment of only getting three embryos, they all underwent PGS (pre-genetic screening). PGS tests the number of chromosomes present on a range of chromosomes responsible for miscarriage. It is a very expensive process - $4000 - whether you  have one embie or 20 the cost is the same and there are no medicare or private health rebates. The reason we decided to go for the screening is because of my multiple miscarriage history. Also my age - it is well known that egg and embryo quality diminishes with the age of the mother.

The chromosomes tested are numbers: 13, 15, 16, 18, 21, 22, X and Y. A healthy embryo will have two copies each of  23 chromosomes. The most well known chromosomal abnormality is trisomy 21 - Down Syndrome. That occurs when there is three copies (tri) of chromosome 21. Other chromosomal abnormalities, or aneuploidy, cause a variety of developmental problems. Most embryos with aneuploidy  don't implant, or miscarry in the first trimester.


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