![]() The volumetric concentration of erythrocytes in the blood is commonly known as hematocrit which is responsible for blood viscosity. ![]() Moreover, they are particularly important in the study of rheology and blood flow dynamics, but also in hemorrhage which is specifically aimed at the study of blood and viscosity. The red blood cells represent the 40–50% of total volume so that this high concentration influences the behavior of the blood more than the other blood cells. The white blood cells defense the organism in the case of pathogens aggression. The platelets are cellular fragments essential for coagulation and in case of vessel lesion. The latter contains the so-called figurative elements including red blood cells (or erythrocytes), white blood cells (or leukocytes) and platelets (thrombocytes), as well as some liquid particles. The former represents the 54% of the circulating blood mass and it is composed by 90% of water and 10% of inorganic substances, including critical proteins which are fundamental for sustaining health and life. Blood consists of two parts: (i) a liquid part, called plasma, and (ii) a corpuscular part, formed by cells or fragments of cells. It is a non-Newtonian fluid composed by many cells with different features and tasks. Keywordsīlood is a fluid in a viscous, red and opaque state, which is distributed in the body through the circulatory system. Results obtained are compliant with values obtained by using the standard viscosity measurement through a viscometer. Moreover, it is the only biological measure being correlated with the other cardiovascular risk factors. This correlation has been supported by performing statistical tests and it suggest that the viscosity could be the main risk factor in cardiovascular diseases. The main contribution regards the correlation between viscosity values and other important biological parameters such as cholesterol. It can be used to perform several observations regards the main factors which can influence blood viscosity. The aim of this study is to estimate blood viscosity by using the regression equation of viscosity which is based on hematocrit and total plasma proteins. Many factors affect blood viscosity, both in physiological and in pathological conditions. Blood viscosity, a measure of the resistance of blood flow, related to its thickness and stickiness, is one of the main biophysical properties of blood. In recent years interest in blood viscosity has increased significantly in different biomedical areas.
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