MedStar St. Mary’s Outpatient Laboratory Centers

MedStar St. Mary's Hospital offers phlebotomy services at various locations. Walk-ins are accepted for general blood testing. An appointment will be required for glucose tolerance tests, semen analysis and DNA testing. 

Laboratory Center: MedStar St. Mary's Hospital 

Registration is located within Outpatient Imaging. Patients must register for all scheduled appointments.

Outpatient Pavilion 
25500 Point Lookout Road
Leonardtown, Maryland 20650
Open 7 a.m. to 6 p.m., Monday through Friday
Open 7 a.m. to noon on Saturdays (registration and lab in main hospital)
Closed Sundays
Phone: 301-475-6133 or 240-434-7497
Learn more

Laboratory Center: Belmont Building

23000 Moakley Street, Suite 103
Leonardtown, MD 20650 
Get directions
Open 7 a.m. to 5 p.m. on Monday, Tuesday, and Thursday
Open 7 a.m. to 4 p.m. on Wednesday Open 7 a.m. to 12 p.m. on Friday
Closed everyday from 12 p.m. to 1 p.m. for lunch. 
Phone: 301-475-2494
Fax: 301-475-8388

Laboratory Center: Chesapeake Charter School Building

20945 Great Mills Road, Suite 202
Lexington Park, MD 20653 
Get directions
Open Monday through Friday from 7 a.m. to 4:30 p.m.
(last draw at 4:15 p.m., last drug screen taken at 4 p.m.)
Closed from 12 p.m. to 1 p.m. for lunch
Phone: 301-866-1464
Fax: 301-862-9575

Laboratory Center: St. Mary's Medical Center

37767 Market Drive (near Golden Beach Road)
Charlotte Hall, MD 20622 

NOTE: The Laboratory Center in Charlotte Hall has closed as of July 31, 2017. 

LabCorp and Quest Diagnostics

Should your insurance require that you utilize Quest or LabCorp for your laboratory services, you must present their completed requisition form to the location for all of your laboratory needs.  

LabCorp and Quest orders are only accepted at the Chesapeake Charter School Building and the Belmont Building. The last specimen collection is performed 15 minutes prior to closing.