assay measurement type kinetic assay kinetic analysis binding kinetics kinetics assay The measurements and reported outcome / result of the kinetic assay quantify a change / response over a time course; the reported result has a time component, for example a reaction constant or rate. This is in contrast to an endpoint that does not have a time dimension, but is associated with a time point as metadata, such as cell viablity at 12, 24 or 72 hs, but not the speed with which the cells propargate or die.