The total amount of blood in a normal person’s body is related to body weight, accounting for about 7%~8% of body weight, i.e., a person weighing 60kg has about 4.2~4.8kg of blood in his body.
Blood is composed of red blood cells, white blood cells and platelets and other blood cells and plasma, belonging to the human body fluids, how many grams of blood in a normal person is based on the weight of the rough calculation, accounting for about 7% to 8% of body weight. Therefore, the heavier a normal person is, the more blood there is in his body. However, the amount of circulating blood in a pregnant woman’s body is increased relative to a non-pregnant woman and is often greater than 7% to 8% of body weight.
When severe hypoproteinemia, malignant tumors and other diseases occur in the human body, resulting in a large amount of fluid in the abdominal cavity, thoracic cavity and other plasma cavities, the amount of blood in the body is less than 7% to 8% of body weight.