Chronic hepatitis D virus (HDV) infection always occurs as a coinfection with hepatitis B virus (HBV) and is the most severe form of viral hepatitis, associated with a high risk of cirrhosis, liver cancer and death. Effective treatment is now available for HDV-HBV coinfection and HDV screening is recommended for all people living with HBV, yet most people in Australia with HDV-HBV are diagnosed too late to prevent complications. This article calls for an urgent change in HDV testing policy and funding to implement reflex HDV antibody (anti-HDV) testing for all people diagnosed with HBV infection, thus enabling timely diagnosis of HDV-HBV coinfection and rapid access to life-saving treatment.