The aim of the present study was to review the laboratory studies in COVID 19 in different patients. The outbreak of Coronavirus 2019 (COVID-19) appeared in Wuhan, China, and the reason for its increasing spread is not fully understood. According to research, COVID-19 virus, like other risk factors in any country, has many heterogeneous effects, especially in the field of environment and energy. The clinical symptoms of this disease are nonspecific and cannot be easily distinguished from other acquired pneumonias. Therefore, radiological findings and laboratory tests play an important role in the diagnosis and follow-up of the disease. Preliminary studies have shown that people with underlying diseases are at higher risk for complications and mortality from COVID-19. Approximately 50% of hospitalized patients suspected of having a new coronavirus have other chronic diseases, and about 40% of hospitalized patients with confirmed new SARS-CoV-2 infection have heart disease. They are vascular or cerebrovascular. The researchers have also found a large difference in mortality by age group.