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In genetics, a biomarker (identified as genetic marker) is a DNA sequence that causes disease or is associated with susceptibility to disease. They can be used to create genetic maps of whatever organism is being studied.ne example of a commonly used biomarker in medicine is prostate-specific antigen (PSA). This marker can be measured as a proxy of prostate size with rapid changes potentially indicating cancer.
Genetic testing is the process of using medical tests to look for changes (mutations) in a personâs genes or chromosomes. Hundreds of different genetic tests are used today, and more are being developed. Genetic testing for diseases that can be inherited Genetic testing can be used in different situations.The type of testing most often used to check for cancer risk is called predictive gene testing. Itâs used to look for gene mutations that might put a person at risk of getting a disease.he obvious benefit of genetic testing is the chance for a better understanding of your risk for a certain disease. Testing is not perfect, but it can often help you make decisions about your health. A negative result on a genetic test in families at risk for a specific cancer may help relieve anxiety or uncertainty.