Quest Diagnostics

Lab Testing at Quest Diagnostics - Mercy Tower A Psc

Quest Diagnostics Patient Service Center in Saint Louis, MO 63141.

Order Lab Tests for Collection at This Location

Browse All Tests

Popular tests at this location:

TSH Lipid Panel CBC A1C Testosterone Vitamin D CMP

Address

621 S New Ballas Rd Suite 23
Saint Louis, MO 63141
St. Louis County

314-610-5793

Hours

Monday	6:30 AM – 5:00 PM
Tuesday	6:30 AM – 5:00 PM
Wednesday	6:30 AM – 5:00 PM
Thursday	6:30 AM – 5:00 PM
Friday	6:30 AM – 5:00 PM
Saturday	8:00 AM – 12:00 PM
Sunday	Closed

Nearby alternatives

Quest Diagnostics - Center For Performance Med
701 S New Ballas Rd, Saint Louis, MO 63141
0.3 mi
LabCorp Saint Louis
747 N New Ballas Rd, Saint Louis, MO 63141
1.7 mi
Arcpoint Labs Of St. Louis West
11255 Olive Blvd, Saint Louis, MO 63141
2 mi
Quest Diagnostics - Wood Lake - Employer Drug Testing Not Offered
1585 Woodlake Dr Ste 115, Chesterfield, MO 63017
3.9 mi
LabCorp Maryland Heights
12685 Dorsett Rd Ste A, Maryland Heights, MO 63043
4.8 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.