US-based consensus standards organization whose documents establish widely used analytical and clinical laboratory performance evaluation protocols for IVDs.

Definition

CLSI is a global, nonprofit, standards development organization that produces consensus documents used by clinical laboratories, IVD manufacturers, and regulators to evaluate diagnostic test performance. Widely referenced CLSI documents include EP05 (precision performance of quantitative measurement methods), EP17 (evaluation of detection capability, including limit of blank, limit of detection, and limit of quantitation), and EP28 (defining, establishing, and verifying reference intervals). While CLSI is a US-headquartered voluntary consensus body rather than a formal ISO or governmental body, its EP-series protocols are referenced internationally and several are FDA-recognized consensus standards under Section 514 of the FD&C Act, and some CLSI documents form the basis of harmonized ISO documents in the analytical performance space.

Why it matters

IVD manufacturers use CLSI EP-series protocols to generate the analytical performance data (precision, linearity, detection limits, reference intervals, method comparison) required to support 510(k), De Novo, or PMA submissions in the US, and analogous analytical performance data required under IVDR Annex I Section 9.1 and Annex XIII. CLSI documents are procedural and statistical study designs, not pass/fail thresholds; the acceptance criteria are set by the manufacturer or by a regulator/standard referencing the protocol.

Common pitfalls

•Citing a CLSI document edition that is not on FDA's current recognized consensus standards list, which forfeits the simplified declaration-of-conformity pathway.
•Confusing CLSI (a voluntary consensus standards developer) with a regulatory or accreditation body; CLSI documents inform but do not themselves confer regulatory clearance.
•Applying default CLSI acceptance criteria without adjusting study design to the assay's actual intended use population and clinically relevant decision points.

Sources

CLSI, About Us · CLSI
FDA Recognized Consensus Standards Database · FDA
AAMI · AAMI

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