Clinical, Diagnostics & Lab Consumables Manufacturing worked example

Shelf-Life Inventory Buffer with daily demand for sellable kits or consumables of 930 units / day: a worked example

Suppose daily demand for sellable kits or consumables falls to 930 units / day. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate inventory needed to cover demand and replenishment lead time while respecting shelf-life, expiration dating, quality holds, and release-test delays.

The inputs for this scenario

  • Daily demand for sellable kits or consumables: 930 units / day (the input this scenario stresses; the baseline uses 1,850)
  • Replenishment and release lead time: 14 days (held at the documented default)
  • Shelf-life and demand-variation safety stock: 6,200 units (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Lead-time cycle stock = daily demand for sellable kits or consumables × replenishment and release lead time.
  • Protected days of supply works out to 0.01 units at these inputs, and this is the headline figure for the scenario.
  • Unprotected days works out to 66.43 days at these inputs.
  • Inventory works out to 930 pieces at these inputs.
  • Daily usage works out to 14 pieces / day at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where daily demand for sellable kits or consumables sits at 1,850 units / day and the headline result is 0.02 units, this scenario comes in 49.73% below the baseline at 0.01 units.
  • It computes the target unexpired finished-goods quantity by adding lead-time cycle stock to a shelf-life and demand-variation safety stock. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Protected days of supply: 0.01 units (headline result)
  • Unprotected days: 66.43 days
  • Inventory: 930 pieces
  • Daily usage: 14 pieces / day

Run it with your numbers

  • To rerun this with your own numbers, open the live Shelf-Life Inventory Buffer calculator, set daily demand for sellable kits or consumables to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.