Quest Diagnostics

Lab Testing at Quest Diagnostics - Riverhead Harrison Ave

Quest Diagnostics Patient Service Center in Riverhead, NY 11901.

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Popular tests at this location:

TSH Lipid Panel CBC A1C Testosterone Vitamin D CMP

Address

889 Harrison Ave Fl 1
Riverhead, NY 11901
Suffolk County

631-727-7727

Hours

Monday	6:00 AM – 3:00 PM
Tuesday	6:00 AM – 3:00 PM
Wednesday	6:00 AM – 3:00 PM
Thursday	6:00 AM – 3:00 PM
Friday	6:00 AM – 3:00 PM
Saturday	6:00 AM – 12:00 PM
Sunday	Closed

Nearby alternatives

LabCorp Riverhead
887 Old Country Rd Ste C, Riverhead, NY 11901
0.4 mi
Citymd Of Riverhead
999 Old Country Rd, Riverhead, NY 11901
0.5 mi
Quest Diagnostics - Wading River
6144 Route 25a Ste 8 Bldg B, Wading River, NY 11792
8 mi
Quest Diagnostics - Hampton Bays Ny
188 W Montauk Hwy Ste E6, Hampton Bays, NY 11946
8.6 mi
LabCorp Mattituck
10095 Main Rd, Mattituck, NY 11952
9 mi

About this location

Quest Diagnostics Patient Service Center. Quest Diagnostics operates one of the largest networks of clinical laboratories in the United States, offering a wide range of diagnostic tests for patients, physicians, and employers.

Listing last updated 2026-04-25.