baseline

Definition / meaning of baseline

An initial measurement that is taken at an early time point to represent a beginning condition, and is used for comparison over time to look for changes. For example, the size of a tumor will be measured before treatment (baseline) and then afterwards to see if the treatment had an effect.

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Find More About 'baseline'

Source(s):

The Web site of the National Cancer Institute (http://www.cancer.gov/)

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