Parental chromosome analysis should be offered where trisomy 13 is due to an unbalanced translocation.
Examples of such accidents are development of an extra chromosome 18 (trisomy 18) and Down syndrome.
Patau syndrome, also called trisomy 13, is a congenital (present at birth) disorder associated with the presence of an extra copy of chromosome 13.
Patau syndrome is named for Klaus Patau, who reported the syndrome and its association with trisomy in 1960.
A condition called trisomy occurs when three, instead of two, copies of a chromosome are present in a developing human embryo.