The Emergency System for Advance Registration of Volunteer Health Professionals (ESAR-VHP) is a federal program created to support states and territories in establishing standardized volunteer registration programs for disasters and public health and medical emergencies.

Disaster Healthcare Volunteers (DHV), California's ESAR-VHP program, administered at the state level, verifies health professionals' identification and credentials so that they can respond more quickly when disaster strikes. By registering through ESAR-VHP, volunteers' identities, licenses, credentials, and accreditations are verified in advance, saving valuable time in emergency situations.