The traditional technique for assaying cell proliferation is to degree DNA synthesis by means of assessing the incorporation of a labeled DNA analog or precursor, an analog of pyrimidine which gets incorporated it to new DNA within the region of thymidine, or [3H]-thymidine) into the genomic DNA of cells during S section of the cell cycle. There are many methods and kits currently to be had which can be used to degree numerous factors of cell proliferation, mitochondrial feature and, in a roundabout way, mobile viability. However, over-evaluation of these assays and wrong interpretation of the records they offer are getting more frequent in the published literature. In a cellular proliferation assay, the output should provide you with an instantaneous and correct size of the wide variety of actively dividing cells in a population, be it cells in way of life or tissues. In comparison, a mobile viability assay is designed to offer an illustration of the wide variety of “healthy” cells within a populace, frequently by way of assessing specific signs of metabolically active cells, frequently related to mitochondrial feature. Unlike a proliferation assay, these measurements do now not distinguish between quiescent/senescent and actively dividing cells. Beta-galactosidase activity assay or staining can imply senescent cells. Assays for the cell cycle evaluation and cellular demise are discussed some place else.