Mercy Laboratory Services - 7345 Watson

Imaging, Labs or Tests
7345 Watson Road
St. Louis, MO 63119

Phone: (314) 633-8551
Fax: (314) 752-3284
Monday-Friday: 7:30 a.m. - 5 p.m.; Saturday: 8 a.m. - noon
Services are provided by Mercy Hospital South Learn more »

Mercy South Laboratory Services offers a full range of lab testing services; more than 5,000 tests to screen for diseases, confirm diagnoses and monitor drug therapy. Laboratory test results are immediately transmitted to your physician’s office.

In addition, we also provide health screens to promote wellness and reduce health risks in the community.

Accreditations and Certifications

Every Mercy South laboratory is:

  • Accredited by the College of American Pathologists (CAP) and The Joint Commission
  • Registered with the Food and Drug Administration (FDA)
  • Certified under the Clinical Laboratory Improvement Amendments of 1988 (CLIA) program

Mercy Lab is pleased to partner with Mayo Medical Laboratories for specialized and esoteric testing. Find our test catalog, specimen requirements, laboratory medicine news, interpretive guides and other information on our regional Mayo partner portal.