end-point assay

in biomolecular screening
https://doi.org/10.1351/goldbook.14128
Kinetic assay run for a set constant incubation time. Typically, at the end of the set incubation time, a reagent that stops the reaction is added to allow postponed measurement of the signal.
Source:
PAC, 2011, 83, 1129. (Glossary of terms used in biomolecular screening (IUPAC Recommendations 2011)) on page 1138 [Terms] [Paper]