Original ResearchPublished 24 September 2026Strengthening the interpretation of longitudinal EQA data through the sporadic inclusion of native human sera in general clinical chemistryLaura Vierbaum · Patricia Kaiser · Ingo Schellenberg · Folker Wenzel · Mario Thevis · Manfred FalckFrontiers in Molecular Biosciencesdoi 10.3389/fmolb.2026.1869542