| Year | Detail |
| 1905 |
Hoffmann-La Roche founded in the U.S. |
| 1969 |
Acquired Kings County Research Laboratory. |
| 1974 |
Revlon, Inc. enters the lab business and adopts the name National Health Laboratories Incorporated (NHL). |
| 1982 |
Acquired Biomedical Reference Laboratories. |
| 1995 |
Roche Biomedical Laboratories (RBL) and National Health Laboratories (NHL) merge to become Laboratory Corporation of America Holdings. |
| 2000 |
Acquired National Genetics Institute. |
| 2001 |
Acquired ViroMed. |
| 2002 |
Acquired Dynacare. |
| 2003 |
DIANON Systems becomes part of Labcorp. |
| 2005 |
Acquired Esoterix, Inc. and US LABS. |
| 2006 |
Litholink becomes part of Labcorp. |
| 2009 |
Acquired Monogram Biosciences. |
| 2010 |
Completed $1 billion acquisition of Genzyme Genetic. |
| 2011 |
Acquired Orchid Cellmark, Inc. (Orchid). |
| 2017 |
Acquired Chiltern, PAML, and Mount Sinai’s Clinical Outreach Laboratories. |
| 2022 |
Personal Genome Diagnostics (PGDx) joins Labcorp. |