Mercy Laboratory Services - O'Fallon

Imaging, Labs or Tests
300 Winding Woods Drive
O Fallon, MO 63366


Phone: (636) 379-4301
Fax: (636) 379-4302
Hours:
Monday-Friday: 7 a.m. - 5 p.m.
Services are provided by Mercy Hospital St. Louis Learn more »

We offer a full range of lab testing services. Test results are immediately transmitted to your physician’s office. Patients may also have specimens collected and tested here and the results sent to a specialist in another city. In addition to routine lab tests most often requested by your physician, we provide health screens to promote wellness and reduce health risks in our community.

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.