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QA/RA Consulting, Auditing & Training
The real test of a GLP audit is not whether it finds signatures missing from records or an outdated procedure – it’s whether the organization can answer a far more uncomfortable question five minutes before an inspection: Can this study be trusted, reconstructed, and defended?
This question highlights where OECD adds real value. While 21 CFR Part 58 gives auditors a clear US regulatory framework for nonclinical studies, the OECD Principles and related series documents widen the lens from local conformity to global credibility, mutual acceptance of data, and a more inspection-ready approach to study oversight. That distinction matters, because GLP compliance was never meant to be a paperwork scavenger hunt.
GLP is a quality system response focused on responsibilities, facilities, documentation, quality assurance, and data integrity, not on box-checking for its own sake. GLP’s origin is tied to the need for auditable, trustworthy safety studies, which is exactly why auditors today have to think beyond “Which requirement applies here?” and toward “Does this system consistently support credible nonclinical data?”
From that perspective, OECD is not a “second version” of 21 CFR Part 58. It plays a different role. 21 CFR Part 58 is a federal regulation for FDA submissions, while OECD is described as an internationally adopted framework that supports Mutual Acceptance of Data (MAD) and cross-border reliance on GLP studies. Put simply: 21 CFR Part 58 tells you what a US regulator expects; OECD helps auditors evaluate whether the same study oversight will hold up in a global regulatory conversation. And yes, global regulators do tend to appreciate when your records can be followed without a decoder ring and three emergency meetings.
That shift in mindset aligns neatly with ISO 19011:2026, the audit-methodology backbone. There are seven auditing principles: integrity, fair presentation, due professional care, confidentiality, independence, evidence-based approach, and risk-based approach. In practice, that means an auditor is not just collecting documents but instead is planning systematically, using appropriate sampling, seeking verifiable objective evidence, and focusing attention on the risks and opportunities that matter most to audit objectives. Following OECD principles strengthens that approach because it encourages auditors to evaluate whether the organization’s systems are robust enough to support internationally credible study conduct, not merely whether a requirement can be pointed to on demand.
This becomes especially visible in protocol control, raw data integrity, report traceability, and QA oversight of critical phases. One of the clearest examples is the traceability chain from protocol → data → report → archival. From an OECD perspective, reporting is not just about producing a final document – it’s about traceability and transparency, explicit linkage from study plan to raw data to final report, and clear identification of critical phases. GLP requirements map to the records, raw data, logs, and processes an auditor should expect to see. In other words, “Show me the report” is fine, but “Tell me, show me, and now trace it all the way back to the original evidence” is much better.
OECD also broadens how auditors think about study oversight. Factors that auditors consider include whether this is a risk-based QA focus, the importance of QAU independence, and the need to inspect high-residual-risk activities and critical phases. Also worth noting are computerized systems, audit trails, metadata, chain of custody, validated systems, and archive readiness – all are central to reconstructing a study. That matters for inspection readiness because readiness is not just looking organized on a Tuesday morning; it’s being able to consistently retrieve the right records, explain the study story coherently, and demonstrate that oversight worked before, during, and after study execution.
This is why a globally defensible GLP audit is both process-based and risk-based. This approach encourages auditors to inspect inputs, controls, outputs, owners, and interfaces for each GLP process, and to weight sampling toward higher-risk areas such as critical study phases, raw data capture, computerized systems, test article handling, and QAU effectiveness. The salient audit question is no longer: “Is there an SOP?” It has now become a group of questions:
For sponsors, laboratories, and manufacturers working across borders, this matters for more than audit elegance. It affects whether nonclinical data can be accepted efficiently, whether follow-up questions multiply, and whether a regulatory inspection becomes a focused review or an archaeological dig. Effective audits do not end at the closing meeting; they move into clear reporting, corrective action, effectiveness verification, and management review. In that sense, global GLP auditing is not just about finding gaps – it’s about strengthening the system’s ability to support reliable regulatory decision making over time.
The takeaway is simple: The best GLP auditors are not just reading regulations. They are applying an evidence-based, risk-based audit approach to determine whether the organization’s system can generate credible, traceable, and globally defensible non-clinical data. 21 CFR Part 58 provides essential regulatory discipline. OECD expands the auditor’s perspective to international acceptance, transparency, and inspection-ready oversight. And ISO 19011:2026 gives the auditor a sharper method for getting there.
That combination is what moves an audit beyond requirement-checking and into real confidence-building territory – which is fortunate, because “we have the document somewhere” has never been a particularly persuasive audit strategy.
ELIQUENT Life Sciences offers training and advisory support in GLP auditing, internal and supplier auditing, inspection readiness, CAPA, and related quality system topics for organizations seeking to strengthen audit effectiveness and regulatory confidence.
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