Fluorescence in situ hybridization (FISH) is a test that “maps” the geneticInherited characteristics. material in a person’s cells. This test can be used to visualize specific genes or portions of genes. FISH testing is done on breast cancer tissue removed during biopsyThe removal and examination of tissue from a living body to discover the presence, cause, or extent of a disease. to see if the cells have extra copies of the HER2 geneA sequence in the DNA which can be passed down from parent to child. Genes helps determine physical and functional traits for the body.
