Chromosome studies may be performed when a child is born with multiple birth defects. They may also be done when people have certain types of leukemias and lymphomas, to look for specific chromosome rearrangements associated with these types of cancers. Direct DNA studies look directly at the gene in question for an error.
Testing methods vary from lab to lab and may affect the likelihood that the lab will identify a mutation in the gene if 1 is present. Different lab studies have the ability to find different types of mutations. Accuracy will vary, depending on the type of genetic testing method performed.
Different kinds of tests show different levels of cancer risk. Some tests may even help people who don't have a personal or family history of cancer. You can be tested by working with your healthcare provider.
Genetic testing can help find diseases that run in a family or don't yet have symptoms.