+A **biomarker** is a measurable indicator of a [Biological State](/wiki/biological_state) or [Disease](/wiki/disease) within an organism. These quantifiable signals, found in blood, tissue, or other samples, provide insights into health, environmental exposure, or therapeutic response.
+## See also
+- [Medicine](/wiki/medicine)
+- [Diagnosis](/wiki/diagnosis)
+- [Pharmacology](/wiki/pharmacology)
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