List of Quest Diagnostics Stores in Barstow, CA Outlet Note Regular Brands Quest Diagnostics California Barstow Rating 4.7 based on 66 votes Products STD Testing Clinical Laboratory Services Drug Test Blood Test NameAddressPhone Name/Address/Phone Quest Diagnostics outlet - Barstow 309 E Mountain View St, Ste 112 (760) 256-8125 People Also Viewed