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Background In patients with bacteremia, delay in appropriate therapy is associated with higher morbidity and mortality. Matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) reduces the time to identification (ID) to approximately 30 minutes. Previously published studies show rapid diagnostics need to be coupled with antibiotic stewardship intervention for maximal benefit. Methods Retrospective, observational review at Cambridge and Everett Hospitals, two inpatient community, teaching hospitals that are part of Cambridge Health Alliance. The purpose is to evaluate the impact of MALDI-TOF by reviewing data in three phases: Microscan ID (January 1 to November 30, 2017), MALDI-TOF alone (December 1, 2017 to December 9, 2018), and MALDI-TOF coupled antimicrobial stewardship (December 10, 2018 to April 30, 2019). The laboratory batches all positive blood cultures to be run via MALDI-TOF mid-morning. In phase 3, a pharmacy resident is notified of the result via an automatic page. The resident determines appropriate empiric therapy using an algorithm developed by the Antimicrobial Stewardship Team and contacts the primary team. Data were collected via a laboratory report and chart review. The primary outcome is time to targeted antimicrobial therapy after ID. Secondary outcomes include time to ID, time to susceptibilities, duration of therapy for blood culture contaminants, and number of pharmacy interventions in phase 3. Results Preliminary data indicate mean time targeted antibiotic therapy was 41:45, 35:58, and 27:39 hours:minutes in phases 1, 2, and 3, respectively. Mean time to ID and final susceptibilities was also reduced in phases 2 and 3. The duration of therapy for blood culture contaminants decreased from 53:50 in phase 1 to 32:48 hours:minutes in phase 2. Pharmacy residents in phase 3 successfully implemented 47 total interventions, 24 (51%) after identification. Conclusion Implementation of MALDI-TOF with and without stewardship intervention successfully decreased time to targeted antibiotic therapy in two community hospitals. Future directions include adding an evening MALDI-TOF run and simplifying pharmacy resident standard operating procedure. Disclosures All authors: No reported disclosures.

open forum infectious diseases

2009. Evaluation of Time to Organism Identification and Pharmacist Impact on Antibiotic Prescribing through Utilization of MALDI-TOF at Two Community, Teaching Hospitals