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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.
There are many different types of genetic tests. Genetic tests can help to: 1  Diagnose disease. 2  Identify gene changes that are responsible for an already diagnosed disease. 3  Determine the severity of a disease.enetic testing is voluntary and the decision about whether to have genetic testing is complex. A geneticist or genetic counselor can help families think about the benefits and limitations of a particular genetic test.