Background: The prevalence of hepatitis B virus (HBV) in the US is ~5%. Patients receiving anticancer therapy with a history of HBV infection are at risk for viral reactivation leading to hepatitis flare, liver failure, and death. The American Society of Clinical Oncology (ASCO) updated 2020 HBV screening and management guidelines recommending all patients have HBV serologies before anticancer therapy initiation. In August 2021, only 17% of patients initiating anticancer therapy at UConn Health had HBV serology screening before treatment. We aimed to increase the HBV screening rate by at least 50%, using HBV serologies before initiation of anticancer therapy. Methods: The plan-do-study-act method was used to conduct this quality improvement (QI) project. To increase the HBV screening rate, we provided education and a two-part HBV serology ordering process improvement. Education consisted of an e-mail to cancer center providers and nurses detailing updated ASCO HBV screening and recommendations. The ordering process improvement plan included 1) multidisciplinary team created HBV serology order, which could be ordered inside or outside of anticancer treatment plan and 2) best practice advisory (BPA) alert to providers when a new anticancer treatment plan was opened. Part 2 of the ordering process improvement plan included incorporation of HBV serology order set directly into anticancer treatment plans along with other baseline laboratory orders to reduce provider time and eliminate the need for BPA. A two-part retrospective chart review was conducted, using an electronic medical record report of patients initiating anticancer treatment plans between treatment periods (pre -intervention and post-intervention). Inclusion criteria included: patients > 18 years and treated with anticancer therapy for newly diagnosed cancer. Patients were excluded if they had known or suspected HBV infection; or were within the Department of Corrections. Results: During the post-implementation phase, 125 patients initiated a new anticancer treatment plan. Of these, 30 (24%) patients were excluded: 18 received prior treatment before HBV serology implementation, 6 received previous anticancer treatment, 5 did not receive anticancer treatment, and 1 was a Department of Correction patient. Out of 95 remaining eligible patients, 84 patients (88.5%) had HBV serologies performed before treatment initiation. Conclusions: Incorporating HBV serologies into anticancer treatment plans appears to be a reliable, acceptable, and valid means to increase adherence to ASCO guidelines related to HBV screening prior to initiation of anticancer therapy. We plan to initiate a follow-up analysis to identify reasons why HBV serologies were not obtained in 12% of patients to inform further QI interventions, and to ensure appropriate management of patients with positive HBV serology results.