Nationwide Implementation of Double Reflex Testing for Hepatitis Delta in Spain: Results From the Retrospective Phase of the Spain‐DDR Study

Between 2022 and 2024, double reflex diagnostic implementation expanded rapidly, demonstrating national feasibility and describing hepatitis D virus seroprevalence. However, regional inequities persist. Sustained uptake will require standardised reflex protocols, harmonization of viral load assays and continuous training to reduce underdiagnosis and improve care of coinfected patients.