In vitro studies expose cultured cells or isolated tissues to a substance and observe effects such as DNA damage, cell death, or altered function. They demonstrate mechanism rather than disease causation.
Concentrations used frequently exceed achievable in vivo levels.
Alternative Names:
Cell Study Evidence, Laboratory Mechanism Evidence
Why it Matters?
In vitro findings support biological plausibility, one of the Bradford Hill considerations, without establishing that the mechanism operates at human exposure levels in an intact organism. Cells lack the metabolic, immune, and repair systems that a living body brings to bear. Expert testimony relying primarily on in vitro evidence for general causation is vulnerable, since mechanism alone does not demonstrate that exposure produces disease.
Frequently Confused with
Related terms
Frequently asked questions
What does in vitro evidence establish?
Why is it insufficient alone?
