Biomarkers are biological variables that can be measured and quantified and which provide
valuable information about the physiological state or diseases. Broadly, biomarkers include not
only the laboratory results for various specimens but also the findings of functional assessments and imaging tests. The term is also used, in a narrower sense, to indicate a sign that can be measured from a blood sample. Biomarkers are useful for early diagnosis, differentiation of etiologies, and predicting prognosis in various diseases. Precision medicine has been proposed as a feature of future medicine.
