OOT (Out of Trend)

Definition

An Out of Trend result is a test result that falls within the established specification limits but deviates noticeably from the expected historical pattern for that product or process. OOT results don't necessarily indicate a failure, but they warrant investigation as an early indicator of potential process drift.

Benefits

Because EBR and LIMS systems retain structured historical data, automated trend analysis can flag OOT results that a manual, batch-by-batch review would likely miss, allowing quality teams to catch subtle process shifts before they progress to an actual OOS failure.

Use Case

A stability testing result remains within specification but is notably lower than the trend established by the previous ten batches. The system flags it as OOT, prompting an investigation into whether a raw material or process change is driving a gradual shift, before the trend progresses to an actual specification failure.

Frequently Asked Questions (FAQ)

Related Terms

• OOS (Out of Specification)
• KPI (Key Performance Indicator)