Founded: 1999 by David Bostwick, MD, MBA, a former Professor of Pathology and Urology at the Mayo Clinic (Minneapolis, MN)

Locations: Virginia, Arizona, New York, Florida, London; just opened a lab in Nashville, Tenn.

Staff: 750

Accession: 2007: 291,000; 2006: 159,000

Days Sales Outstanding: 2007: 46.9; 2006: 49

Current Bad Debt Percentage (2007): 7.4 percent

Growth Focus: Increase market share in AP specialties, including gynecology, gastroenterology, and nephrology; expand into AP specialties such as dermatopathology.