List of Quest Diagnostics Stores in Harlingen, TX Outlet Note Regular Brands Quest Diagnostics Texas Harlingen Rating 4.7 based on 66 votes Products STD Testing Clinical Laboratory Services Drug Test Blood Test NameAddressPhone Name/Address/Phone Quest Diagnostics outlet - Harlingen 1821 S Sesame Dr, Ste 8 (956) 440-1548 People Also Viewed