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10: Cell Counting Viability and Culture Calculations

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    222990

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    Cell counts turn a culture observation into numbers that guide the next step. Concentration, viable yield, and percent viability describe different properties. This chapter explains representative sampling, hemocytometer counting, dye exclusion, and dilution corrections. Worked examples show how to calculate available cells and seeding volumes. You will also learn to check count quality and record enough detail for another person to follow the calculation. A cell count estimates a population from a small measured sample. The estimate works only when the sample reflects the full suspension. Mixing, sampling, loading, and identifying cells all matter before any arithmetic begins. Keep three questions separate: how many cells are in each milliliter, how many cells are available in total, and what fraction pass the viability test. One milliliter equals 1,000 microliters. One million cells can also be written as 1.0 × 10⁶ cells. Write units at each step to keep these quantities distinct.

    Learning Objectives
    • After completing this chapter, you should be able to do the following:

      1. Distinguish cell concentration, total cell yield, percent viability, and confluence.

      2. Explain how a standard hemocytometer uses a known volume to estimate cells per milliliter.

      3. Apply a consistent boundary rule and identify sampling or loading problems that can bias a count.

      4. Calculate viable and total cell concentrations, percent viability, and viable cell yield from raw counts.

      5. Calculate sample dilution factors and the volumes needed to reach a specified seeding target.

      6. Evaluate repeated counts and document the evidence needed to support a culture decision.

    This page titled 10: Cell Counting Viability and Culture Calculations was last modified on Wed, 21 Oct 2026 01:35:27 GMT and is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Emalee MacKenzie.