Trisomy 16

Overview
Trisomy 16 is a chromosomal abnormality in which there are three copies of chromosome 16 rather than two. It is the most common chromosomal cause of miscarriage during the first trimester of pregnancy.

It is not possible for a child to be born with an extra copy of this chromosome present in all cells (called Full Trisomy 16).

It is possible to be born with the mosaic form.