Blood rheology examination includes whole blood viscosity measurement, plasma viscosity measurement, red blood cell deformability measurement, etc. It is mainly designed to study the flow of blood and its components with or without deformation, and to assist in the diagnosis of diseases. 1. Measurement of whole blood viscosity: Increased whole blood viscosity often suggests abnormal plasma proteins, increased number of red blood cells, etc., which is often associated with a variety of diseases, such as hypertension, coronary heart disease, atherosclerosis, diabetes mellitus and so on. Decrease in viscosity of whole blood can be seen in various kinds of anemia and blood loss. 2. Measurement of plasma viscosity: Increased plasma viscosity is commonly seen in diseases such as multiple myeloma, diabetes mellitus, hyperlipidemia, etc., which will lead to increased plasma globulin and blood lipids. 3. Erythrocyte deformability: If there is a decrease in the deformability of erythrocytes, it is usually seen in hereditary spherocytosis, dysglobulinemia and so on. Blood rheology examination is of great significance in the study of blood fluidity and viscosity, aggregation and deformability of erythrocytes and platelets, etc. If the results are abnormal, it is recommended to have further examination under the guidance of a physician to clarify the cause of the disease and carry out treatment.