{"id":"AIBD-0607","title":"Nabla ambient AI scribe reduced physicians' note-writing time in a three-arm randomized trial at UCLA Health","summary":"In a UCLA Health randomized trial of 238 outpatient physicians, the Nabla ambient scribe cut time-in-note by 9.5% against usual care; DAX Copilot showed no significant change.","date_observed":"2025-01-03","date_basis":"event","date_precision":"day","benefit_status":"reported","source_collection":null,"source_entry":null,"account":"UCLA Health ran a pragmatic randomized trial of two ambient AI scribes from 4 November 2024 to 3 January 2025. The trial team assigned 238 outpatient physicians in 14 specialties to Microsoft Dragon Ambient eXperience (DAX) Copilot, to Nabla, or to usual care. The scribes recorded visits and drafted notes inside the Epic record. Nabla was used in 29.5% of 23,653 visits. Physicians who used Nabla cut their time-in-note by 9.5% against the control group (95% confidence interval 1.8% to 17.2%). The DAX group showed no significant change in time-in-note. Survey scores for burnout and task load suggested improvement with both scribes, but the authors write that these secondary results need confirmation in larger trials. Physicians reported clinically significant inaccuracies \"occasionally\", and one mild adverse event was reported. The UCLA Department of Medicine and other UCLA units funded the trial, which ran at a single academic health system over two months.","category":"general benefit","unexpected":false,"purpose":"Nabla is built to record clinical encounters and draft visit notes so that clinicians spend less time on documentation. The measured time saving is that purpose.","system":"Nabla ambient AI scribe","model_version":"Nabla version 1.5","developer":"Nabla","deployer":"UCLA Health","location":"UCLA Health outpatient clinics, Los Angeles, California, United States","domain":"Healthcare","segment":null,"benefit_type":"Reduced Task Time","taxonomy_note":null,"registry_ids":{},"ratings":[{"group":"personal","depth":1,"reason":"Physicians who used Nabla spent 9.5% less time writing notes than physicians in usual care."},{"group":"organizational","depth":1,"reason":"The health system recovered documentation time across 23,653 visits in the Nabla arm without other changes to clinic work."}],"ai_role":{"status":"assessed","statement":"Physicians were randomized to a scribe or to usual care, and the trial compared changes in time-in-note against the control group. The trial isolates the effect of offering the scribe. Physicians chose when to use it, and they used Nabla in 29.5% of visits."},"evidence":[{"kind":"peer-reviewed study","citation":"Wolfe J, Welsh SM. Ambient Documentation Systems in Emergency Medicine: A Scoping Review of Clinical Precision, Patient Experience, Throughput, and Quality. Cureus 2026;18(4):e106643. doi:10.7759/cureus.106643. Review by emergency physicians at University Hospitals Cleveland Medical Center and Case Western Reserve University; the authors declare no financial support and no financial relationships.","title":"Ambient Documentation Systems in Emergency Medicine: A Scoping Review of Clinical Precision, Patient Experience, Throughput, and Quality","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC13154711/","date":"2026-04-08","written_by":"independent","quote":"Lukac et al. conducted a parallel three-group pragmatic RCT randomizing 238 physicians to Microsoft DAX Copilot, Nabla, or usual care; Nabla users achieved a 9.5% reduction in time-in-note versus control (p = 0.02), while DAX showed no significant difference in this outcome (p = 0.66)"},{"kind":"peer-reviewed study","citation":"Lukac PJ, Turner W, Vangala S, et al. Ambient AI Scribes in Clinical Practice: A Randomized Trial. NEJM AI 2025;2(12). doi:10.1056/aioa2501000. Author manuscript in PMC. Written by UCLA Health physicians and researchers, the deploying health system.","title":"Ambient AI Scribes in Clinical Practice: A Randomized Trial","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC12768499/","date":"2025-11-26","written_by":"deployer","quote":"Nabla users experienced a 9.5% (95% confidence interval [CI], -17.2% to -1.8%; P=0.02) decrease in time-in-note versus the control group, whereas DAX users exhibited no significant change versus the control group (-1.7%; 95% CI, -9.4% to +5.9%; P=0.66)."}],"replication":{"produced_by":["Nabla was integrated into Epic so that drafted text filled the native note.","Physicians received one hour of virtual training before the trial.","Physicians chose the visits on which to use the scribe."],"must_hold":["Physicians use the scribe on a meaningful share of visits.","Physicians review drafts for occasional inaccuracies."],"echoes":[{"date":"2025-01-03","setting":"Same UCLA trial, DAX Copilot arm","model_version":null,"outcome":"did not recur","source":"https://pmc.ncbi.nlm.nih.gov/articles/PMC12768499/"},{"date":"2025-03-27","setting":"UW Health ambulatory clinics, Wisconsin and Illinois, Abridge scribe, stepped-wedge randomized trial","model_version":null,"outcome":"recurred","source":"https://pmc.ncbi.nlm.nih.gov/articles/PMC12858090/"}]},"paired_incident":{"database":"AI Incident Database","identifier":"827","title":"AI Transcription Tool Whisper Reportedly Inserting Fabricated Content in Medical Transcripts","url":"https://incidentdatabase.ai/cite/827","severity":null,"group":"personal","basis":"Both records concern AI transcription of patient consultations for clinical notes, and in this incident fabricated text in medical transcripts put the clinicians who rely on them at risk of recording false information."},"headline":"*Nabla* scribe cut note time for UCLA physicians in a randomized trial","metric":"cut their time-in-note by 9.5% against the control group","comparator":{"against":"Physicians randomized to usual care without an AI scribe","before":"Usual-care change in time-in-note","after":"9.5% greater decrease in time-in-note with Nabla","basis":"measured","quote":"Nabla users experienced a 9.5% (95% confidence interval [CI], -17.2% to -1.8%; P=0.02) decrease in time-in-note versus the control group","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC12768499/"},"later":{"status":"unknown","date":null,"note":"The cited sources do not report what UCLA Health did after the trial.","quote":null,"url":null},"value":null,"developer_country":"France","deployer_country":"United States","unrated_because":null,"brief_notes":null,"brief":null,"revisions":[{"date":"2026-10-29","change":"Added the case.","source":"https://pmc.ncbi.nlm.nih.gov/articles/PMC13154711/","editor":"AIBD"},{"date":"2026-10-29","change":"Linked a comparable incident in the AI Incident Database (incident 827).","source":"https://incidentdatabase.ai/cite/827","editor":"AIBD"}],"confidence":"studied","shade":"high","claim_status":"Independently studied","claim_basis":"Sources: one independent peer-reviewed study and the deployer's peer-reviewed study. The cited evidence includes no finding by a regulator or court.","case_jurisdictions":["United States"],"profile":{"case_id":"AIBD-0607","catalog_version":"1.0.0","source_fingerprint":"e7cae5572179957f39c0f25040603141b719ba74722fa36ab61ddf14e64f2639","collection_refs":[{"collection_id":"aibd","version":"2026-10-29"},{"collection_id":"viator","version":"2026-10-25"}],"source_ids":["AIBD-0607-source-0001","AIBD-0607-source-0002"],"families":{"strategic assessments":{"state":"unresolved","provenance":{"kind":"curatorial","basis":"Editorial assignment.","record_fields":[],"source_refs":[]},"reason":"Editorial assignment.","review_state":"not_assessed","coverage":"partial","record_ids":[]},"evaluations":{"state":"value_present","value":{"kind":"identifiers","identifiers":["AIBD-0607-evaluation-1"],"role":"Evaluations of the benefit"},"provenance":{"kind":"source_review","basis":"Editorial assignment.","record_fields":[],"source_refs":["AIBD-0607-source-0002"],"reviewed_on":"2026-10-29"},"review_state":"reviewed","coverage":"partial","record_ids":["AIBD-0607-evaluation-1"]},"monetary observations":{"state":"unresolved","provenance":{"kind":"curatorial","basis":"Editorial assignment.","record_fields":[],"source_refs":[]},"reason":"Editorial assignment.","review_state":"not_assessed","coverage":"partial","record_ids":[]},"institutional decisions":{"state":"unresolved","provenance":{"kind":"curatorial","basis":"Editorial assignment.","record_fields":[],"source_refs":[]},"reason":"Editorial assignment.","review_state":"not_assessed","coverage":"partial","record_ids":[]}},"fields":{"actors[]":{"state":"value_present","value":{"kind":"record_fields","fields":{"developer":"Nabla","deployer":"UCLA Health"}},"provenance":{"kind":"legacy_record","basis":"Editorial assignment.","record_fields":["developer","deployer"],"source_refs":[]},"review_state":"record_mapped","coverage":"partial"},"actors[].ownership_control":{"state":"unresolved","provenance":{"kind":"curatorial","basis":"Editorial assignment.","record_fields":[],"source_refs":[]},"reason":"This is an explicit unresolved assignment: the sources on record do not settle this question.","review_state":"not_assessed","coverage":"partial"},"ai_contribution":{"state":"value_present","value":{"kind":"record_fields","fields":{"ai_role":{"status":"assessed","statement":"Physicians were randomized to a scribe or to usual care, and the trial compared changes in time-in-note against the control group. 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