Cell Therapy & Gene Therapy Equipment worked example

Cell Expansion Yield at 92% minimum acceptable expansion yield: a worked example

Push minimum acceptable expansion yield up to 92% and the picture changes. This example computes every intermediate figure at that operating point. a manufacturing scientist needs to see whether a cell expansion run produced enough viable cells for the intended dose or lot

The inputs for this scenario

  • Harvested viable cell count: 8,500,000,000 viable cells (unchanged)
  • Target viable cell count: 10,000,000,000 viable cells (unchanged)
  • Minimum acceptable expansion yield: 92 % (raised for this scenario; the documented default is 80)

Working through the calculation

  • Applying the documented formula (Cell expansion yield = harvested viable cell count ÷ target viable cell count × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 85 % for cell expansion yield, the number this scenario is built around.
  • At this operating point the engine returns 7 points for yield gap to minimum target.
  • At this operating point the engine returns 8,500,000,000 count for harvested viable cell count.
  • At this operating point the engine returns 10,000,000,000 count for target viable cell count.

How this compares with the baseline

  • Against the tool's baseline example, where minimum acceptable expansion yield sits at 80% and the headline result is 85 %, this scenario lands almost exactly on the baseline at 85 %.
  • It computes expansion yield as harvested viable cells divided by target viable cells, then reports the point gap between that yield and your minimum acceptable threshold. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Cell expansion yield: 85 % (headline result)
  • Yield gap to minimum target: 7 points
  • Harvested viable cell count: 8,500,000,000 count
  • Target viable cell count: 10,000,000,000 count

Run it with your numbers

  • Every input above is editable in the live Cell Expansion Yield calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.