Testing Locations » Nevada » Las Vegas NV » Quest Diagnostics – Las Vegas West Tropical Parkway Quest Diagnostics – Las Vegas West Tropical Parkway Quest Diagnostics – Las Vegas West Tropical Parkway7891 W Tropical PkwySte 110Las Vegas, NV 89149-4548 United States Located in the Centennial Center plaza. On W Tropical Pkwy between Durango and Centennial Center Blvd