With the shift of the medical model from "treating diseases" to "maintaining health," people are increasingly focused on identifying risk factors before diseases occur. Vascular sampling, especially blood tests, can provide rich information about the body's metabolism, organ function, and physiological status. Components in the blood, such as blood sugar, lipids, and inflammatory markers, are often the "early warning signals" of disease onset. For example, vascular diseases like atherosclerosis may have no obvious symptoms in the early stages, but through blood tests, hidden changes such as lipid abnormalities, blood sugar disorders, or chronic inflammation can be detected, which are important risk factors for serious conditions like stroke and heart disease. In addition, technological advancements have also driven development in this field. Although emerging methods such as genetic testing can provide information on hereditary risks, routine blood tests remain the fundamental tool for assessing current health status and the risk of common diseases.