Cell death analysis is looking at Apoptosis (cell death). Studying cell death is used to assess the toxicity of a chemical. The number of cells that die between set time points are determined. This data then allows the scientist to draw conclusions about how toxic a component (added to the media) really is.
Cell death analysis is carried out in an analytical instrument called a flow cytometer. Different dyes are used in this process. Viable cells and dead cells are stained differently. This difference is used to measure the number of dead cells