Quest Diagnostics

Lab Testing at Quest Diagnostics - O'fallon

Quest Diagnostics Patient Service Center in O Fallon, MO 63368.

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Popular tests at this location:

TSH Lipid Panel CBC A1C Testosterone Vitamin D CMP

Address

3449 Pheasant Meadow Dr Ste 101
O Fallon, MO 63368
St. Charles County

636-485-9450

Hours

Monday	6:30 AM – 3:00 PM
Tuesday	6:30 AM – 3:00 PM
Wednesday	6:30 AM – 3:00 PM
Thursday	6:30 AM – 3:00 PM
Friday	6:30 AM – 3:00 PM
Saturday	Closed
Sunday	Closed

Nearby alternatives

LabCorp Saint Charles
1475 Kisker Rd Ste 140, Saint Charles, MO 63304
4.3 mi
LabCorp O Fallon
1002 Peruque Crossing Ct, O Fallon, MO 63366
5.6 mi
LabCorp Saint Peters
205 First Executive Ave, Saint Peters, MO 63376
6.9 mi
Quest Diagnostics - Chesterfield
17300 N Outer 40 Ste 104, Chesterfield, MO 63005
7.2 mi
Quest Diagnostics - St Peters
4101 Mexico Rd Ste E, Saint Peters, MO 63376
7.4 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.