Testing Locations » California » Modesto CA » Quest Diagnostics – Modesto 1510 Florida Avenue – Employer Drug Testing Not Offered Quest Diagnostics – Modesto 1510 Florida Avenue – Employer Drug Testing Not Offered Quest Diagnostics – Modesto 1510 Florida Avenue – Employer Drug Testing Not Offered1510 Florida AveSte EModesto, CA 95350-4437 United States