the.com/biomarker

A biological snitch that tells doctors what's wrong before you can.

means A measurable biological trait — a molecule, gene, or characteristic in blood, tissue, or other body material — that signals the presence or progress of a disease, condition, or process in the body.

from A straightforward 20th-century compound: 'bio-' from Greek 'bios' (life) welded to 'marker,' from the old verb 'to mark' (to note or signify), via the shared Germanic root also behind 'margin' and 'mark' as a boundary-stone sense. The term took off with modern lab medicine's need for a word covering everything from cholesterol levels to tumor proteins — a single tag for 'the body's measurable tell.'

origin
measurable sign of disease, not a guess
types
blood, genes, imaging, even your breath
fame
cholesterol and PSA are biomarkers you know
catch
a good biomarker still needs a good doctor
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