Testing Locations » California » San Dimas CA » Quest Diagnostics – San Dimas West Covina Boulevard – Employer Drug Testing Not Offered Quest Diagnostics – San Dimas West Covina Boulevard – Employer Drug Testing Not Offered Quest Diagnostics – San Dimas West Covina Boulevard – Employer Drug Testing Not Offered1330 W Covina BlvdSte 205San Dimas, CA 91773-3200 United States Located next to San Dimas Hospital. rnBuilding shares parking lot with Hospital.rnQuantiferon collection after 200pm