Genetic testing can help find diseases that run in a family or don't yet have symptoms.

Detailed information on uniparental disomy.

Detailed information on the different types of chromosome abnormality

Detailed information on trinucleotide repeats, including fragile X syndrome.

Detailed information on translocation Down syndrome

Detailed information on testing for birth defects

Detailed information on teratogens and non-teratogenic agents

Detailed information on examples of teratogens

Detailed information on finding a support group for parents affected by a birth defect.

To look for single gene defects, healthcare providers look at the DNA to see if it has any errors in it. Errors are known as mutations.