Clinical, Diagnostics & Lab Consumables Manufacturing worked example

Stability Study Sample Count at 99% stability chamber and lab availability: a worked example

This scenario runs the stability study sample count calculation on the strong side: 99% stability chamber and lab availability, with every other input held at its documented default. a diagnostics or lab consumables team needs to reserve enough samples for shelf-life claims, accelerated aging, real-time studies, and retest needs for a stability protocol

The inputs for this scenario

  • Stability samples prepared per pull cycle: 36 samples / cycle (unchanged)
  • Planned stability pulls or timepoints: 18 cycles (unchanged)
  • Stability chamber and lab availability: 99 % (raised for this scenario; the documented default is 96)
  • Valid stability samples after inspection and documentation: 98 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross stability study sample count = stability samples prepared per pull cycle × planned stability pulls or timepoints) to the inputs above produces each figure below.
  • At this operating point the engine returns 629 accepted units for usable stability study sample count, the number this scenario is built around.
  • At this operating point the engine returns 648 accepted units for gross stability study sample count.
  • At this operating point the engine returns 6.48 accepted units for stability study sample count lost to availability limits.
  • At this operating point the engine returns 12.83 accepted units for stability study sample count lost to rejects or invalid samples.

How this compares with the baseline

  • Against the tool's baseline example, where stability chamber and lab availability sits at 96% and the headline result is 610 accepted units, this scenario comes in 3.12% above the baseline at 629 accepted units.
  • Use it when designing a stability protocol, confirming sample sufficiency before pull-down, or reconciling planned versus usable samples mid-study. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Usable stability study sample count: 629 accepted units (headline result)
  • Gross stability study sample count: 648 accepted units
  • Stability Study Sample Count lost to availability limits: 6.48 accepted units
  • Stability Study Sample Count lost to rejects or invalid samples: 12.83 accepted units

Run it with your numbers

  • Every input above is editable in the live Stability Study Sample Count calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.