Testing Locations » Missouri » Saint Louis MO » City Diagnostics – City Diagnostics – Drug Testing Only (Preferred) City Diagnostics – City Diagnostics – Drug Testing Only (Preferred) City Diagnostics – City Diagnostics – Drug Testing Only (Preferred)1408 N Kingshighway BlvdSte 224Saint Louis, MO 63113-1419 United States SATURDAY’S- BY APPOINTMENT ONLY