There is no index in routine blood test to reflect the blood viscosity, because routine blood test is a method to check the number, shape and proportion of various blood cells in peripheral blood through automatic blood analyzer, while blood consistency is the viscosity of blood, and the measurement method of blood consistency is to apply the method of blood rheology to determine the blood consistency, so routine blood test can’t reflect the blood consistency, but through the routine blood test, we can make a general judgment about the viscosity of the blood. However, through routine blood tests, it is possible to make a general judgment on the viscosity of the blood. Through routine blood tests, it is possible to understand the number of various blood cells in the blood routine, and the number of blood cells is often closely related to blood viscosity, for example, when the number of red blood cells, the number of white blood cells, or the number of platelets in a person’s peripheral blood increases significantly, the viscosity of the blood tends to increase significantly. Although routine blood tests cannot accurately reflect the viscosity of blood, they can generally determine the viscosity of blood.