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What Does In Vitro Mean?


Updated October 03, 2012


An in vitro test is a medical test, experiment, or procedure that is done outside of the body, such as in a test tube or laboratory dish.

This is in contrast to an "in vivo" test, one that is done in a living organism, such as a laboratory animal or in humans.

Most chemotherapy drugs for lung cancer are studied in vitro before they are tested in vivo.

The results of in vitro tests with the new chemotherapy drug appear promising. So it will now be tested in vivo in a clinical trial.
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