Is Down syndrome hereditary?

In most cases, Down syndrome is not hereditary. About 95% of cases (Trisomy 21 and Mosaic Down syndrome) happen randomly during cell division.

Only Translocation Down syndrome, which makes up around 3–4% of cases, can sometimes be inherited from a parent who carries a balanced translocation. Even then, the chance of passing it on depends on the parent’s genetic makeup.

Genetic counselling can help families understand the risks and inheritance patterns.

For advice on hereditary aspects and NDIS-supported therapies, contact us now.