1. Thermo Fisher Scientific Inc.
2. F. Hoffmann-La Roche Ltd
3. Abbott Laboratories Inc
4. Quest Diagnostics
5. Siemens AG
6. Laboratory Corporation of America (LabCorp)
7. Danaher Corporation
8. United States Drug Testing Laboratories Inc. (USDTL)
9. Alere (Now Abbott)
10. Agilent Technologies Inc.
11. LGC Limited
12. Randox Testing Services
13. Sonic Healthcare
14. Bio-Rad Laboratories
Inc
15. Psychemedics Corporation
16. Dr?gerwerk AG & Co. KGaA
17. Express Diagnostics Int’l
Inc (Acquired by CareHealth America Corporation)
18. OraSure Technologies Inc
19. Alfa Scientific Designs
Inc
20. Biophor Diagnostics
Inc
21. Cordant Health Solutions
22. DrugScan
23. Precision Diagnostics