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Find all detailed info for Quest Diagnostics in O'Fallon, MO, including address, opening hours and contact number with ease.

  • Quest Diagnostics
  • 3449 Pheasant Meadow Dr, O'Fallon, MO 63368
  • 636-485-9450
  • Mon: 8:00 AM - 5:00 PM
    Tue: 8:00 AM - 5:00 PM
    Wed: 8:00 AM - 5:00 PM
    Thu: 8:00 AM - 5:00 PM
    Fri: 8:00 AM - 5:00 PM
    Sat: 9:30 AM - 12:00 PM
    Sun: Closed

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