Overview
EN ISO 20184-1:2018 (ISO 20184-1:2018) - "Molecular in vitro diagnostic examinations - Specifications for pre‑examination processes for frozen tissue - Part 1: Isolated RNA" provides standardized guidance for the pre‑examination phase of molecular IVD testing when RNA is extracted from frozen tissue. The standard focuses on minimizing changes to RNA profiles that can occur during collection, transport, handling, freezing, storage and initial processing so that downstream molecular assays accurately reflect the in‑vivo state.
Key topics and requirements
- Scope and applicability: Applies to medical and molecular pathology laboratories, biobanks, IVD developers/manufacturers, research organisations and regulatory authorities involved with RNA extracted from frozen tissue. Chemically stabilized tissues (pre‑treatment before freezing) are excluded.
- Pre‑examination controls: Emphasizes documentation and traceability for specimen donor/patient information and specimen details during the pre‑examination phase.
- Specimen collection and transport: Guidance on collection best practices, required information, preparations for transport and handling during transport to control pre‑analytical variability.
- Laboratory reception and evaluation: Reception documentation, pathological evaluation and selection of sample(s) for RNA analysis.
- Freezing and storage: Recommendations for freezing workflows and storage requirements for frozen tissues to preserve RNA integrity.
- RNA isolation: General requirements, recommendations for using commercial kits or laboratory‑developed protocols, and considerations to preserve RNA quality.
- RNA quality and quantity assessment: Requirements for assessing isolated RNA prior to molecular assays.
- Storage of isolated RNA: Guidance on post‑isolation storage conditions and record keeping.
- Informative annex: Includes impact of pre‑examination variables (example: liver tissue) on RNA profiles to illustrate practical consequences of non‑standardized handling.
Note: The standard uses prescriptive language - “shall” for requirements and “should” for recommendations - and refers to ISO 15189 for quality and competence needs.
Practical applications
- Ensures RNA integrity and reliable molecular diagnostic results for assays such as gene expression profiling, RNA sequencing and RNA‑based biomarker tests.
- Helps laboratories implement standardized sample handling, documentation and storage workflows to reduce pre‑analytical variability.
- Guides biobanks and clinical sites on specimen collection, labeling and transport procedures to maintain sample value for future RNA analyses.
- Supports IVD developers and manufacturers in designing kits and instructions that align with recognized pre‑analytical requirements.
- Aids regulatory bodies and quality managers in assessing laboratory conformity and traceability related to pre‑examination processes.
Related standards
- ISO 15189 (Medical laboratories - Requirements for quality and competence) - cited normative reference.
- Other parts of the ISO 20184 series (see ISO catalogue) covering complementary specimen types or analytes.
Keywords: EN ISO 20184-1:2018, ISO 20184-1, pre‑examination, frozen tissue, isolated RNA, molecular in vitro diagnostic, RNA integrity, sample handling, biobanks, molecular pathology.