| Business | Phone |
| Dorsey Hall Medical Laboratory 9501 Old Annapolis Rd # 203, Ellicott City 21042 | (410) 740-4001 |
| Laboratory Corp Of America 4801 Dorsey Hall Dr # 203, Ellicott City 21042 | (410) 609-1300 |
| Quest Diagnostics Inc 9055 Chevrolet Dr # 101, Ellicott City 21042 | (410) 750-6485 |
| Ying Pathological Laboratory 3440 Ellicott Center Dr, Ellicott City 21043 | (410) 465-0060 |