Laboratory Services

Mercy offers a full range of laboratory services with quick turnaround times for our customers.

Patients may have specimens collected here at the hospital, or at our clinics throughout the area. Test results are transmitted immediately to your primary-care or specialty physician.

In addition to the routine lab testing most often requested by doctors, our services include:

  • Pre-employment drug screening or screening for workers’ compensation injuries
  • Federal drug screen collections for the Department of Transportation
  • Health screens to promote wellness and reduce health risks
  • Outpatient transfusion services

Locations offering Laboratory Services

mile(s)
Name
Distance

Mercy Laboratory Services - Crestwood

10024 Watson Road
St. Louis, MO 63126
(314) 919-2538
Hours of Operation:

Monday: 7:00 am–5:00 pm
Tuesday: 7:00 am–5:00 pm
Wednesday: 7:00 am–5:00 pm
Thursday: 7:00 am–5:00 pm
Friday: 7:00 am–5:00 pm
Saturday: closed
Sunday: closed

11.78 mi

Mercy Laboratory Services - Old Tesson

12348 Old Tesson Road
St. Louis, MO 63128
(314) 467-3838
Hours of Operation:

Monday: 7:00 am–5:00 pm
Tuesday: 7:00 am–5:00 pm
Wednesday: 7:00 am–5:00 pm
Thursday: 7:00 am–5:00 pm
Friday: 7:00 am–5:00 pm
Saturday: 8:00 am–12:00 pm
Sunday: closed

12.31 mi

Mercy Laboratory Services - Mercy Heart Hospital St. Louis

625 S. New Ballas Road
St. Louis, MO 63141
(314) 251-1023
Hours of Operation:

Monday: 5:00 am–5:00 pm
Tuesday: 5:00 am–5:00 pm
Wednesday: 5:00 am–5:00 pm
Thursday: 5:00 am–5:00 pm
Friday: 5:00 am–5:00 pm
Saturday: closed
Sunday: closed

13.22 mi

Mercy Laboratory Services - David C. Pratt Cancer Center

607 S. New Ballas Road
St. Louis, MO 63141
(314) 251-6933 x27338
Hours of Operation:

Monday: 7:00 am–4:30 pm
Tuesday: 7:00 am–4:30 pm
Wednesday: 7:00 am–4:30 pm
Thursday: 7:00 am–4:30 pm
Friday: 7:00 am–4:30 pm
Saturday: closed
Sunday: closed

13.22 mi

Mercy Laboratory Services - Florissant Meadows

572 Highway 67
Florissant, MO 63031
(314) 972-9994
Hours of Operation:

Monday: 7:00 am–3:30 pm
Tuesday: 8:30 am–5:00 pm
Wednesday: 7:00 am–3:30 pm
Thursday: 8:30 am–5:00 pm
Friday: 7:00 am–3:30 pm
Saturday: closed
Sunday: closed

13.98 mi

Mercy Laboratory Services - Northwest

801 Hazelwest Drive
Hazelwood, MO 63042
(314) 919-2738
Hours of Operation:

Monday: 7:00 am–5:00 pm
Tuesday: 7:00 am–5:00 pm
Wednesday: 7:00 am–5:00 pm
Thursday: 7:00 am–5:00 pm
Friday: 7:00 am–5:00 pm
Saturday: 8:00 am–12:00 pm
Sunday: closed

14.39 mi

Mercy Laboratory Services - Medical Tower A

621 S. New Ballas Road, Tower A
St. Louis, MO 63141
(314) 251-4980
Hours of Operation:

Monday-Friday: 7 a.m.–5 p.m.
Saturday: 8 a.m. – noon

15.26 mi

Mercy Laboratory Services - Fenton

1203 Smizer Mill Road
Fenton, MO 63026
(636) 717-1376
Hours of Operation:

Monday: 7:00 am–5:00 pm
Tuesday: 7:00 am–5:00 pm
Wednesday: 7:00 am–5:00 pm
Thursday: 7:00 am–5:00 pm
Friday: 7:00 am–5:00 pm
Saturday: 8:00 am–12:00 pm
Sunday: closed

16.30 mi

Mercy Laboratory Services - Clayton-Clarkson

15945 Clayton Road
Ballwin, MO 63011
(636) 256-5315
Hours of Operation:

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

17.80 mi
Mercy Clinic Palliative Care- Clayton and Clarkson
(314) 251-4652
Mercy Mocha and More Cafe - Clayton-Clarkson
(636) 256-5118
Mercy Outpatient Surgery Center - Clayton-Clarkson
(636) 256-5250
Mercy Pathology - Clayton-Clarkson
(636) 256-5271

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