Testing Locations » Texas » Dallas TX » Quest Diagnostics – Walnut Hill – Employer Drug Testing Not Offered Quest Diagnostics – Walnut Hill – Employer Drug Testing Not Offered Quest Diagnostics – Walnut Hill – Employer Drug Testing Not Offered8210 Walnut Hill LaneSuite 300Dallas, TX 75231-4440 United States Texas Health Presbyterian Professional Office Building #1, 3rd Floor.
