Cell viability and proliferation assays measure whether cultured cells are alive and whether their numbers are increasing, making them foundational in-vitro readouts. This guide explains both.
Viability vs proliferation
Viability assays ask whether cells are alive and metabolically active at a point in time. Proliferation assays ask whether the cell population is growing over time. They answer related but distinct questions.
How viability is measured
Common viability assays use a reagent that live cells convert into a colored or fluorescent product, so signal intensity reflects the number of metabolically active cells.
How proliferation is measured
Proliferation assays track an increase in cell number or in a marker of cell division over a time course, comparing conditions against controls.
Interpreting the data
Because signal depends on cell type and conditions, results are normalized to controls and compared within a single experiment.
Related research guides
- In-vitro methods & assays (overview)
- Binding assays (affinity)
- Controls & replicates
- Verify peptide purity
Research-use note
All compounds referenced are supplied for in vitro laboratory research use only. They are not for human or animal use.
Related research: Reconstitution Solution.
