ISO standard specifying requirements for establishing metrological traceability of values assigned to calibrators, controls, and human samples for IVD measurement procedures.

Definition

ISO 17511:2020, In vitro diagnostic medical devices, Requirements for establishing metrological traceability of values assigned to calibrators, trueness control materials and human samples, specifies how manufacturers must establish and document a traceability chain linking the value assigned to a routine measurement result back to a higher-order reference measurement procedure or reference material, where one exists. It defines the calibration hierarchy (reference measurement procedure, reference material, manufacturer's selected measurement procedure, calibrator, end-user measurement procedure, patient sample) and requires manufacturers to document measurement uncertainty at each step of the chain.

Why it matters

ISO 17511 underpins comparability of results between different IVD manufacturers' assays for the same analyte, such as HbA1c, creatinine, or troponin, which is essential for clinical decision-making that relies on standardized cutoffs. Under IVDR, Annex I Section 9.4 requires metrological traceability, and ISO 17511:2020 is the primary standard cited to satisfy that requirement; the 2020 edition replaced the narrower ISO 17511:2003, extending the traceability model to include assays without an available higher-order reference (using the manufacturer's selected measurement procedure as the top of the hierarchy).

Common pitfalls

•Assuming every analyte has an internationally recognized higher-order reference measurement procedure; many do not, requiring the manufacturer's own selected measurement procedure to serve as the top of the hierarchy under the 2020 edition's expanded model.
•Documenting only the calibrator traceability while omitting the uncertainty budget contribution at each link, which notified bodies increasingly expect for Class C/D IVDs.
•Treating traceability documentation as a one-time exercise rather than updating it when a reference material lot, reference method, or calibrator formulation changes.

Sources

ISO 17511:2020 · ISO
Regulation (EU) 2017/746, Annex I Section 9.4 · EUR-Lex
FDA Recognized Consensus Standards · FDA

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