MedTech Manufacturing worked example

Controlled Environment Monitoring Cost at 72% sampling frequency per location per event: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop sampling frequency per location per event to 72%, then walk the calculation through step by step. Estimate environmental monitoring sample count from monitoring locations, sampling frequency, and minimum required samples per ISO 14644.

The inputs for this scenario

  • Active EM monitoring locations in classified area: 24 locations (held at the documented default)
  • Sampling frequency per location per event: 72 % (the input this scenario stresses; the baseline uses 100)
  • Minimum samples mandated per monitoring event: 5 samples (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Calculated EM samples = monitoring locations × sampling frequency rate.
  • Required sample size works out to 18 samples at these inputs, and this is the headline figure for the scenario.
  • Calculated sample works out to 18 samples at these inputs.
  • Minimum sample size works out to 5 samples at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where sampling frequency per location per event sits at 100% and the headline result is 24 samples, this scenario comes in 25% below the baseline at 18 samples.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to sampling frequency per location per event, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It sizes a single monitoring event by count only — it does not allocate samples by risk (Grade A vs Grade D), distinguish viable from non-viable methods, or account for alert/action-level re-sampling after an excursion.

Results at a glance

  • Required sample size: 18 samples (headline result)
  • Calculated sample: 18 samples
  • Minimum sample size: 5 samples

Run it with your numbers

  • To rerun this with your own numbers, open the live Controlled Environment Monitoring Cost calculator, set sampling frequency per location per event to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.