Homocysteine (Hcy) is a sulfur-containing amino acid metabolized by methionine, 80% of Hcy conjugated by disulfide and protein in the blood, only a small part of free homocysteine to participate in the cycle. Hcy levels are closely related to cardiovascular disease, are an important risk factor for cardiovascular disease. Increased blood Hcy to cause arterial injury by stimulated blood vessel wall, to formed inflammation and wall plaques, and eventually blocked the flow of cardiac blood. Deficient nutrition for Vitamin B followed with moderate or mild Hcy increased, also increases the risk of heart disease. Hipro's homocysteine reagent blood test kit can be used to determine the content of homocysteine (HCY) in the human serum and plasma in vitro quantitative determination.