Critical Limit Deviation

A critical limit deviation occurs when a measurement or observation at a critical control point falls outside the limit established in a food-safety plan. It means the process is no longer demonstrably under control at that point and requires immediate corrective action, product assessment and documentation.

Examples of critical limit deviations

• A cooked product does not reach the required internal temperature specified by the validated cooking procedure.
• A refrigerated food is held above the maximum temperature established in the food-safety plan.
• A cooling process fails to meet its required time-and-temperature limits.
• A metal detector or other validated control fails its required performance check in a food production operation.

What to do when a deviation occurs

1. Stop or control the process: prevent additional product from being affected while the issue is assessed.
2. Identify affected product: determine the batch, quantity, time period and any product already distributed or served.
3. Assess and correct: follow the written corrective-action procedure. This may involve continued cooking, rapid cooling, reprocessing when permitted, holding for evaluation or discarding the product.
4. Document the event: record the measurement, time, product, action taken, responsible person and final disposition.
5. Investigate the cause: determine why the limit was missed and implement measures to prevent recurrence.

Critical limit deviation versus routine deviation

A critical limit deviation is specifically linked to a critical limit at a critical control point in a HACCP-based system. A broader process deviation may involve any departure from a procedure, specification or operational target. The required response depends on the hazard and the food-safety plan.

Chef’s safety note: Do not release affected food simply because it looks or smells normal. Follow the written corrective-action procedure and obtain qualified food-safety guidance when product safety is uncertain.

Key distinction: A critical limit deviation is a failure to meet a defined food-safety limit, not merely a minor variation in product quality.