Quest Diagnostics

Lab Testing at Quest Diagnostics - Greenwich/Cos Cob - Employer Drug Testing Not Offered

Quest Diagnostics Patient Service Center in Cos Cob, CT 06807.

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Popular tests at this location:

TSH Lipid Panel CBC A1C Testosterone Vitamin D CMP

Address

405 E Putnam Ave
Cos Cob, CT 06807
Fairfield County

203-561-8506

Hours

Monday	6:30 AM – 4:00 PM
Tuesday	6:30 AM – 4:00 PM
Wednesday	6:30 AM – 4:00 PM
Thursday	6:30 AM – 4:00 PM
Friday	6:30 AM – 4:00 PM
Saturday	7:00 AM – 11:00 AM
Sunday	Closed

Nearby alternatives

Quest Diagnostics - Stamford Summer St
1250 Summer St Ste 203, Stamford, CT 06905
3.2 mi
LabCorp Stamford
1290 Summer St Ste 5100, Stamford, CT 06905
3.2 mi
LabCorp Greenwich
81 Holly Hill Ln Floor 3, Greenwich, CT 06830
3.4 mi
Citymd Of Rye Brook
108 S Ridge St, Rye Brook, NY 10573
5.2 mi
Quest Diagnostics - Darien
557 Post Rd, Darien, CT 06820
7.5 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.