Epistemic Hygiene in Practice: A Diagnostic Framework for Contemporary Knowledge Claims

This paper introduces a practical diagnostic framework for identifying and addressing structural failures in contemporary knowledge claims. The framework identifies "untypeable claims" as a distinct epistemic category—claims that are neither false nor true but lack operational typing conditions. The methodology integrates three diagnostic layers:1. The Φ-gate (NAEI) for operational typing,2. Phenomenosophic measurement conditions identifying measurement collapse,3. Cryptosophic access analysis revealing structural asymmetries in knowledge access. The framework is demonstrated through applied case studies including AI safety discourse, scientific communication, public deliberation, and medicalization. A preliminary inter-rater pilot study suggests the framework can function as a shared diagnostic instrument across domains. This preprint presents the applied framework building on the theoretical foundation developed in:Isopahkala (2026) – Access Collapse: A Typed Structural Boundary for Operational Access. Follow-up methodological validation framework:DOI: https://doi.org/10.5281/zenodo.18868587