From the Introduction: "COVID-19 [coronavirus disease 2019] testing--including for diagnosis, screening, and surveillance--is a critical component of responding to the COVID-19 pandemic, and its implementation has posed numerous challenges. Issues have included those related to Food and Drug Administration (FDA) regulation of tests, reimbursement and coverage for testing, equitable access to testing, and infrastructure and supply chain stressors, among others. In particular, the diagnostic testing supply chain has shown evidence of significant and ongoing stress since early in the pandemic, and problems persist with ascertainment, production, and distribution of almost all testing supply chain components."
CRS In Focus, IF11774
Congressional Research Service: https://crsreports.congress.gov/