What should happen after a protocol deviation is detected?

Short answer

When a protocol deviation is identified, protect the participant first, document exactly what happened and assess implications for safety and data integrity. Follow the approved escalation, reporting and investigation process, then correct systemic causes where possible.

Why

A protocol deviation is a departure from the approved trial plan or trial-related procedures, but not every deviation has the same importance. Start by asking whether the participant is in immediate danger or whether a critical eligibility criterion, dose or primary endpoint may be compromised. Document the timeline, source evidence, involved procedures and clinical context.

Notify the investigator and appropriate sponsor or oversight functions under the applicable reporting rules. Review whether the deviation was isolated or reflects a recurring process weakness and determine corrective action when warranted. Reporting obligations to an IRB, ethics committee or regulator depend on type, seriousness, jurisdiction and protocol.

Avoid both extremes: not every missed questionnaire is a major safety event, and an apparently harmless deviation should not be hidden to make the data look clean.

A strong answer covers

Distinguish a protocol deviation from an automatic reportable serious breach