has assay format has endpoint has assay method involves biological process cell death Pharmacology: Primary Pharmacodynamics viability measurement method percent cell viability cell based format cell-based format cell viability assay This assay type measures the cellular state of living or dying by measuring an indicator of life or death. Cell life indicators include ATP content, cell number, dehydrogenase activity, DNA content, esterase activity, mitochondrial membrane potential, membrane integrity, and protease activity. Cell death indicators include caspase activity, chromatin condensation, and phospholipid redistribution. viability assay viability assays