Testing Locations » Missouri » Saint Louis MO » Quest Diagnostics – 777 Ballas – Employer Drug Testing Not Offered Quest Diagnostics – 777 Ballas – Employer Drug Testing Not Offered Quest Diagnostics – 777 Ballas – Employer Drug Testing Not Offered777 S New Ballas RdSaint Louis, MO 63141-8705 United States Northeast corner between I-40 and I-270, across from Bus Depot
