Quest Diagnostics

Lab Testing at Quest Diagnostics - Darien

Quest Diagnostics Patient Service Center in Darien, CT 06820.

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Popular tests at this location:

TSH Lipid Panel CBC A1C Testosterone Vitamin D CMP

Address

557 Post Rd
Darien, CT 06820
Fairfield County

475-328-4366

Hours

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

Nearby alternatives

Quest Diagnostics - Norwalk 148 East Avenue - Employer Drug Testing Not Offered
148 East Ave, Norwalk, CT 06851
3.4 mi
Quest Diagnostics - Norwalk Cross Street - Employer Drug Testing Not Offered
40 Cross St Ste 260, Norwalk, CT 06851
3.4 mi
LabCorp Norwalk
55 Westport Ave, Norwalk, CT 06851
4 mi
LabCorp Stamford
1290 Summer St Ste 5100, Stamford, CT 06905
4.3 mi
Quest Diagnostics - Stamford Summer St
1250 Summer St Ste 203, Stamford, CT 06905
4.3 mi

More lab options around Darien

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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.