How is cell viability percentage calculated?
Published Sep 18, 2026Updated Sep 19, 2026Last verified Sep 18, 2026Requests recorded in this site’s own server logs, with the crawler identity checked by reverse DNS or IP range.Google8First collected Sep 19, 2026Recent requestsGoogleSep 20, 2026GoogleSep 20, 2026GoogleSep 20, 2026GoogleSep 20, 2026GoogleSep 20, 2026GoogleSep 20, 2026GoogleSep 19, 2026GoogleSep 19, 2026
Quick answer
Viability percentage = viable cells ÷ total cells counted × 100. With dye exclusion, unstained cells count as viable and stained cells as dead. This can be done manually on a hemocytometer or with an automated counter using trypan blue or AO/PI. The viable cell count, as an absolute number or concentration, is usually reported alongside the percentage, because a high percentage can still mean too few cells [2][3].
69 words9 sources
Answer
Plate-reader assays such as MTT, resazurin or ATP give a relative signal, not a per-cell percentage. They are usually expressed as a percentage of an untreated control [1].
Sources
- journalCell Viability Assays (Assay Guidance Manual) — National Center for Biotechnology Information (NCBI Bookshelf), Riss TL et al. · accessed Sep 19, 2026 · Evidence page
- journalChallenges of Cell Counting in Cell Therapy Products — Cell Transplantation (Liu M et al.) · accessed Sep 19, 2026 · Evidence page
- journalCAR T cell viability release testing and clinical outcomes: is there a lower limit? — Blood (Chong EA et al.), 134(21):1873–1875 · accessed Sep 19, 2026 · Evidence page
- journalQuality standards for NK cell immunotherapies — Frontiers in Bioengineering and Biotechnology (von Werz et al.) · accessed Sep 19, 2026 · Evidence page
- academicCell Viability – Flow Cytometry Facility — University of Toronto, Temerty Faculty of Medicine Flow Cytometry Facility · accessed Sep 19, 2026 · Evidence page
- journalPlasma membrane permeabilization following cell death: many ways to dye! — Cell Death Discovery (De Schutter E et al.) · accessed Sep 19, 2026 · Evidence page
- journalAssessing Adipocyte Viability and Surgeons' Work Efficiency by Comparing Different Liposuction Methods — Plastic and Reconstructive Surgery Global Open (Urbonas T et al.) · accessed Sep 19, 2026 · Evidence page
- journalQuantitative assessment of the impact of cryopreservation on human bone marrow-derived mesenchymal stem cells: up to 24 h post-thaw and beyond — Stem Cell Research & Therapy (Bahsoun S, Coopman K, Akam EC) · accessed Sep 19, 2026 · Evidence page
- governmentContent and Review of Chemistry, Manufacturing, and Control (CMC) Information for Human Somatic Cell Therapy Investigational New Drug Applications (INDs) — U.S. Food and Drug Administration · accessed Sep 19, 2026 · Evidence page