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Is Quest Diagnostics Open Today? Operating Hours, Schedules, and 2026 Facility Updates

"Navigating medical testing schedules requires precise timing, and figuring out whether a major laboratory network is currently operating can prevent wasted trips and delayed clinical diagnoses. Quest Diagnostics operates thousands of patient service centers (PSCs) across the United States, but facility hours fluctuate widely based on regional staffing, laboratory processing volume, inside-hospital locations versus standalone sites, and federal or state holidays in 2026. Standard operating schedules for Quest Diagnostics generally span Monday through Friday, starting as early as 6:30 AM to accommodate fasting blood draws, and closing between 3..."

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