In the fourth quarter of 2023, testing revenues were down 73% and affected some of the company's key metrics. Besides, Labcorp's operations are also subject to the effects of macroeconomic factors in the United States and globally. These include significant economic fluctuations as a result of the disturbed geopolitical situation and inflation, all leading to an increase in the costs of goods and services. Throughout most of the months of 2023, Labcorp.'s Early Development Research Laboratories business grappled with non-human primate (NHP)-related supply chain issues.