PMID- 35211976 OWN - NLM STAT- MEDLINE DCOM- 20220407 LR - 20220513 IS - 1537-2995 (Electronic) IS - 0041-1132 (Linking) VI - 62 IP - 4 DP - 2022 Apr TI - Validation of automated fluorescent-based technology for measuring total nucleated cell viability of hematopoietic progenitor cell products. PG - 848-856 LID - 10.1111/trf.16837 [doi] AB - BACKGROUND: A reliable rapid method for measuring total nucleated cell (TNC) viability is essential for cell-based products manufacturing. The trypan blue (TB) exclusion method, commonly used to measure TNC viability of hematopoietic progenitor cell (HPC) products, is a subjective assay, typically uses a microscope, and includes a limited number of cells. The NucleoCounter NC-200 is an automated fluorescent-based cell counter that uses pre-calibrated cartridges with acridine orange and DAPI dyes to measure cell count and viability. This study describes the validation of the NC-200 for testing HPC's viability. METHODS: Samples from 189 fresh and 60 cryopreserved HPC products were included. Fresh products were tested for viability after collection by both TB and NC-200. 7-aminoactinomycin D (7AAD) CD45+ cell viability results were obtained from a flow cytometry test. Cryopreserved products thawed specimens were tested for viability by both TB and NC-200. The NC-200 viability results were compared with the other methods. Acceptability criteria were defined as