The book explores the role of flow cytometry in varied fields, from clinical diagnosis to toxicology. This comprehensive book offers insights into biomarkers, cellular analysis, and safety evaluations. Organized into fifteen chapters, this book explores flowcytometry's historical journey, scientific validation, and implementation in toxicity studies with case studies, technical and applied approaches, pictorial representations, informative tables, and simple language, It will be an invaluable resource for researchers, academia, biopharma industries, graduate and postgraduate students, Ph.D., and post-doctoral fellows working in the fields of toxicology/biosafety, and biomedical research.