Standard Operating Procedures (SOPs) are written instructions that describe how to perform routine laboratory activities and study-specific tasks in a GLP-compliant facility. The OECD GLP Principles mandate that SOPs be approved by Test Facility Management, readily available to personnel at their workstations, and subject to periodic review and revision. SOPs ensure consistency, traceability, and quality across all operations within the test facility.
Purpose and Scope
SOPs cover all activities that are not explicitly detailed in the study plan, including equipment operation and maintenance, test system handling, data recording, cleaning procedures, and quality assurance activities. They provide the standardization necessary for reproducible results and are a primary focus during regulatory inspections. Deviations from SOPs must be authorized by the Study Director and documented with justification.
SOP Format and Content
Each SOP must have a unique identifier, effective date, version number, and approval signatures from the author, reviewer, and authorizing management. The content should be written in clear, step-by-step language that can be followed consistently by trained personnel. Supporting references, appendices, and related SOPs should be cross-referenced to provide complete context.
Lifecycle Management
SOPs follow a defined lifecycle: creation, review, approval, distribution, implementation, periodic review, revision, and eventual retirement. The Quality Assurance Unit (QAU) typically coordinates the SOP management system and verifies that current versions are in use. An SOP matrix or index helps personnel locate the correct procedure for each task.
Training and Compliance
All personnel must be trained on relevant SOPs before performing the tasks they describe, and training records must be maintained in personnel files. SOP training is verified during QAU inspections and regulatory authority audits. Personnel are expected to follow SOPs exactly; any suggestion for improvement should be submitted through the document change control process.
Conclusion
SOPs are the operational backbone of GLP compliance, translating regulatory principles into daily laboratory practice. An effective SOP system requires careful document management, ongoing training, and a culture of adherence and continuous improvement. Well-maintained SOPs demonstrate regulatory commitment and facilitate consistent, high-quality study conduct.
