Genetic testing, also known as DNA testing, is used to identify changes in DNA sequence or chromosome structure. Genetic testing can also include measuring the results of genetic changes, such as RNA analysis as an output of gene expression, or through biochemical analysis to measure specific protein output.

What is genomic testing used for?

A genomic test looks more widely at what's called your genome -- your full set of genetic "code" or instructions. It checks for gene mutations in your cancer to predict how it might act. A genomic test could help your doctor tell how fast-growing your cancer might be and how likely it is to spread.

What is the difference between genetic and genomic testing?

Genomic testing is often confused with genetic testing. The main difference is that genetic tests are designed to detect a single gene mutation (such as the BRCA1 and BRCA2 mutations associated with breast and ovarian cancer), while genomic tests look at all of your genes.