While each individual doctor may have his or her own reasons for using Quest Diagnostics for clinical diagnostic services, there are a few factors that may have an influence over this choice, including the fact that this company has numerous locations in multiple American states in addition to international locations in places such as the United Kingdom and Mexico; this could add a convenience factor that makes Quest Diagnostics easy for many doctors to use. Additionally, Quest Diagnostics does have a demonstrably good reputation both in the business world and within the medical community. The company has been featured on Forbes magazine's "World's Most Admired Companies" list multiple times since 2008.
According to the company itself, as of 2015, it provides services for a large proportion all doctors and hospital in the United States, totaling to about half of all medical professionals and medical centers. Quest Diagnostics also states that they offer an unparalleled range of test types and strategies, which could have some impact on a doctor's choice of which company to use in processing lab results. In addition to potentially offering convenience, unique services and a good reputation, Quest Diagnostics has also worked to secure a unique niche in the diagnostic testing world by continually acquiring competitor companies.