Serum tube separates serum via the normal process of blood coagulation and serum can be further used after centrifugation. Serum tube is mainly used in serum tests such as serum biochemical analysis (liver function, renal function, myocardial enzymes, amylase,etc.),electrolyte analysis(serum potassium, sodium, chloride, calcium, phosphorus, etc.), thyroid function, AIDS, tumor markers and serology, drug testing, etc.