| Business | Phone |
| Tristar Medical Lab Inc 444 N Frederick Ave, Gaithersburg 20877 | (301) 926-7646 |
| Carla B Mac Leod & Assoc 18207 Flower Hill Way # A, Gaithersburg 20879 | (301) 681-7006 |
| Roveko Limited 107 Argosy Dr, Gaithersburg 20878 | (301) 921-0104 |
| Diagnostic Assay Svc 9290 Gaither Rd, Gaithersburg 20877 | (301) 840-9220 |
| Gene Array Inc 201 Perry Pkwy, Gaithersburg 20877 | (301) 956-1064 |
| Genedx 207 Perry Pkwy # 2, Gaithersburg 20877 | (301) 519-2100 |
| Immu Quest Laboratories 362 Christopher Ave, Gaithersburg 20879 | (301) 990-3680 |
| Laboratory Corp Of America 19261 Montgomery Vlg Ave # G21, Gaithersburg 20886 | (301) 926-1837 |
| Kam Tek Inc 7858 Beechcraft Ave, Gaithersburg 20879 | (301) 208-2505 |