Trisomy 13 (Patau’s Syndrome)

What is a Trisomy?
A trisomy is a chromosomal abnormality in which there is an extra chromosome in the cells of a person’s body. Normally, there are 46 chromosomes in each cell. A trisomy occurs when there are 47 chromosomes in each cell instead of the usual 46. A trisomy can occur with any of the chromosomes.

What is Trisomy 13 (Patau’s Syndrome)?
Trisomy 13 is a syndrome caused by an extra 13th chromosome.

Why does this happen?
The exact reason why this happens is not known. There is nothing one can do to prevent this.

How often does this happen?
One out of every 20,000-25,000 babies is born with this condition. Girls are affected more often than boys.

How is it diagnosed?
Some problems associated with Trisomy can be seen on a routine prenatal ultrasound. Your doctor may want to test the fluid in your womb (Amniocentesis), or from the placenta (Chorion Villous Sampling). These tests can detect chromosomal abnormalities. The Maternal-Fetal Medicine doctors will carefully watch your baby’s development in your womb.