List of Quest Diagnostics Stores in Frederick, MD Outlet Note Regular Brands Quest Diagnostics Maryland Frederick Rating 4.7 based on 66 votes Products STD Testing Clinical Laboratory Services Drug Test Blood Test NameAddressPhone Name/Address/Phone Quest Diagnostics outlet - Frederick 915 Toll House Ave, Ste 203 (301) 696-0764 Quest Diagnostics outlet - Frederick 1560 Opossumtown Pike, Ste A-22 (301) 662-9298 People Also Viewed