Comment on: Bringing Diagnostic Accuracy Back Into Focus: The Case of APRi in Biliary Atresia

At the core of any diagnostic accuracy study lies the principle of discrimination—the ability of a biomarker or test to correctly classify individuals into clinically relevant groups. This is typically assessed through binary outcomes and metrics such as sensitivity, specificity, and likelihood ratios. Meta-analyses in this context must rely on appropriate diagnostic performance models, not on single-group pooled means across heterogeneous strata [1].