Overview
ISO 18704:2026 establishes standard requirements and recommendations for the pre-examination processes associated with the isolation and analysis of cell-free DNA (cfDNA) from human body fluids excluding blood. This international standard, developed by the International Organization for Standardization (ISO), provides a framework for medical laboratories, research institutions, diagnostic developers, biobanks, and regulatory authorities to ensure consistency, reliability, and validity when collecting, handling, storing, transporting, processing, and documenting urine, pleural effusions, ascites, cerebrospinal fluid (CSF), saliva, and other relevant body fluids for cfDNA molecular in vitro diagnostic examinations.
By standardizing the pre-examination workflow, ISO 18704:2026 minimizes variability and degradation risks, supporting the accuracy and reproducibility of downstream cfDNA diagnostics and research.
Key Topics
- Pre-Examination Process Standards: Defines minimum requirements and best practices for collection, stabilization, and documentation to prevent unwanted biological or chemical changes in cfDNA profiles.
- Specimen Handling and Collection: Specifies detailed procedures for correct identification, patient consent, and proper labeling, as well as guidance for both professional and self-collection scenarios.
- Storage and Transport Conditions: Recommends measures for maintaining sample integrity during storage and transport, including the optional or required use of cfDNA stabilizing solutions and proper temperature regulation.
- Processing for cfDNA Isolation: Covers procedures such as centrifugation and sample purification techniques, while emphasizing prevention of cross-contamination and integrity loss.
- Risk Management and Quality Assurance: Requires risk assessment and mitigation to ensure examination performance, referencing standards for quality management systems (e.g., ISO 15189, ISO 13485).
- Documentation and Traceability: Stresses comprehensive record keeping at every step-patient information, device traceability, collection/processing timing-all critical for regulatory compliance and sample traceability.
Applications
ISO 18704:2026 benefits a wide range of organizations and professionals by providing practical guidance for:
- Medical Diagnostic Laboratories: Ensuring cfDNA tests on urine and non-blood body fluids are consistent and reproducible, enhancing test validity for disease detection, monitoring, and prognosis.
- Research and Biobanking: Facilitating standardized biofluid sample handling to support longitudinal studies, biomarker discovery, and multi-center research with comparable cfDNA quality and yields.
- IVD Developers and Manufacturers: Informing design and validation of diagnostic kits and collection devices tailored for cfDNA analyses from diverse body fluids.
- Regulatory and Accreditation Bodies: Offering recognized benchmarks for inspection, certification, and regulatory review of molecular diagnostic workflows and laboratory competence.
- Healthcare Institutions: Integrating standardized procedures across various sites-hospitals, clinics, and home collection scenarios-to improve patient safety, data quality, and logistical efficiency in cfDNA-related testing.
By following the ISO 18704:2026 standard, stakeholders reduce variability introduced during specimen pre-processing, leading to more reliable clinical and research outcomes in molecular diagnostics.
Related Standards
Several international standards complement or relate to the implementation of ISO 18704:2026, including:
- ISO 15189 - Medical laboratories - Requirements for quality and competence: Core laboratory quality and procedural requirements.
- ISO 13485 - Medical devices - Quality management systems - Requirements for regulatory purposes: Quality management for device manufacturers, including IVDs.
- ISO 20186-3 - Molecular in vitro diagnostic examinations - Specifications for pre-examination processes for venous whole blood - Isolated circulating cell-free DNA: Protocols for cfDNA from blood.
- ISO 20387 - Biobanking - General requirements for biobanking: Guidelines for handling biospecimens for research or clinical use.
- ISO 14971 - Application of risk management to medical devices.
- ISO 20658 - Medical laboratories - Requirements for pre-examination processes.
Practical Value
By adhering to ISO 18704:2026, organizations enhance the reliability of molecular diagnostic examinations involving cfDNA from urine and other body fluids. The standard supports improved diagnostic accuracy, robust research data, and efficient regulatory compliance-ultimately contributing to advancements in personalized medicine and translational research in molecular diagnostics.