MedStar St. Mary’s Outpatient Laboratory Centers

MedStar St. Mary's Hospital offers phlebotomy services at various locations. Patients must register for all scheduled appointments. Walk-ins are accepted for general blood testing. An appointment will be required for glucose tolerance tests, semen analysis, and DNA testing.  The last specimen collection is performed 15 minutes prior to closing at each site. 

Not all insurances are accepted at the hospital laboratory center. Patients are encouraged to visit the satellite centers at the Belmont Building in Leonardtown and the Chesapeake Charter School in Lexington Park.

NOTE: The laboratory services in Charlotte Hall and MedStar St. Mary's Outpatient Pavilion have now been relocated. Lab draws and specimen drop off are now located within the main hospital building through the front entrance and at the locations below. Learn more about recent laboratory centralization changes here.

Laboratory Center at MedStar St. Mary's Hospital 

Registration is located behind the front desk in the main hospital lobby. 

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 
Closed Sundays
Phone: 301-475-6133
Fax: 301-475-6165 

Laboratory Center at the Belmont Building

23000 Moakley Street, Suite 103
Leonardtown, MD 20650 
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 every day from 12 p.m. to 1 p.m. for lunch. 
Phone: 301-475-2494
Fax: 301-475-8388

Laboratory Center at the Chesapeake Charter School Building

20945 Great Mills Road, Suite 202
Lexington Park, MD 20653 
Open Monday through Friday from 7 a.m. to 4 p.m.
Closed from 11:45 a.m. to 1 p.m. for lunch
Phone: 301-866-1464
Fax: 301-862-9575

LabCorp and Quest Diagnostics

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

Insurance Information

Not all insurances are accepted at the hospital laboratory and it is recommended patients contact their insurance providers prior to visiting. All insurances are accepted at MedStar St. Mary’s Hospital’s laboratory centers at the Belmont Building in Leonardtown and at the Chesapeake Charter School in Lexington Park.

Insurance questions / concerns: 
301-475-6023 or 301-475-6024