List of Quest Diagnostics Stores in Walnut Creek, CA Outlet Note Regular Brands Quest Diagnostics California Walnut Creek Rating 4.7 based on 66 votes Products STD Testing Clinical Laboratory Services Drug Test Blood Test NameAddressPhone Name/Address/Phone Quest Diagnostics outlet - Walnut Creek 108 La Casa Via, Ste 105 (925) 930-6897 Quest Diagnostics outlet - Walnut Creek 110 La Casa Via, Ste 110 (925) 930-6897 People Also Viewed