Method Validation vs Verification Explained

Method Validation vs Verification Explained: Method validation establishes whether a method performs adequately for its intended purpose. Method verification confirms that a laboratory can achieve appropriate performance when introducing an already validated method.

Why this topic matters: The required extent depends on whether the procedure is standardised, modified, laboratory-developed or used in a new context.

Step 1 — Scope the problem: State the intended use, matrix, analyte, range, reporting thresholds and clinical or regulatory decision context.

Step 2 — Apply the method: Choose fit-for-purpose characteristics such as accuracy, precision, specificity, sensitivity, limits and robustness.

Step 3 — Sustain the result: Design experiments before collecting data, use stated acceptance criteria and authorise use only after evidence is reviewed.

Practical laboratory example: A validated pathogen PCR kit is introduced for a specimen type not covered by the manufacturer. The change may require more extensive evaluation than routine local verification.

Common errors: Calling a literature search full validation, changing acceptance limits after observing results, or failing to control protocol versions. Procedures need to withstand real laboratory conditions and staff turnover, rather than merely look complete during audits.

Evidence to keep: Approved protocol, raw data, calculations, deviations, summary report and technical authorisation. The records should allow an independent reviewer to reconstruct how and why technical decisions were made.

Action to take this week: Build a validation or verification matrix that connects each performance claim to an experiment and acceptance criterion. Assign an owner and decide what evidence will demonstrate improvement.

Authoritative references: ISO 15189:2022, ISO/IEC 17025:2017 and relevant method-specific guidance. Always obtain the applicable standard and check its scope before interpreting this educational overview as an accreditation requirement.