November 2020. Electronic health record log data is increasingly being used in health services and informatics research. Measures are often study-specific and not replicable across institutions or vendors, which limits the generalizability of findings. However, most major EHR vendors calculate use measures from log data and make those measures available to practice and hospital managers, often for identifying inefficiencies. We surveyed the landscape of vendor-provided EHR use measures for outpatient providers, and compared the existing measures to previously proposed measures. Use of these measures can improve standardization in research using these data for insights into clinician workload, administrative burden of EHRs, and provider burnout.