Blood Percentage in Human Body

The volume of blood in an individual’s body vary from one individual to another. There are lots of factors upon which the blood percentage in the human body depends. Age and size are the two main factors.

The total volume of blood in the human body in litres normally ranges from 4.5 to 5.7 liters. The average blood percentage in the human body is approximately 7 per cent of the body weight. In this article, we’ll discuss the quantity and normal blood percentage in the human body, along with shocks and blood loss. 

Average Blood in Human Body in Liters

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The total blood volume is different in the case of infants, children, and adults. Pregnant women have a different blood percentage in the human body when compared to normal adults. In this part, we will look into total blood in the human body in liters in detail. We will be discussing blood volume. As stated above, the normal blood percentage in the human body is about 7 percent of the body weight.

Infants or babies have approximately 75ml of blood per kilogram of their body weight. So if an infant weighs around 8 pounds, he/she will have approximately 270 ml of blood. An average child weighs around 80 pounds. The blood volume in the child’s body is supposed to be around 2.65 liters of blood. For an average adult, the quantity of blood in the human body in litres is estimated to be around 4.5 to 5.7 litres. Pregnant women have a considerable high blood volume to support the growing baby. It's about 30 to 50 percent greater than a normal adult female. It can be seen that the total blood volume varies with age, sex, and body weight. 

Blood Volume Test

This is a test used to determine the volume of blood in the human body in litres and track the movement of the blood cells. It generally tests the blood volume in a human body. In this test, a small tracer element is injected into the bloodstream. The medical professional uses various imaging techniques to trace the movements of the blood cells and measure the average blood in the human body in litres. This test is often recommended by the doctors if the patient shows congestive heart or kidney failure or shocks.

Blood Loss and Shock 

The term ‘“shock” can be used to denote a medical condition where sufficient oxygen does not reach every part of the body. Severe states of shock can prove to be quite fatal. Nominal blood loss may not be much of a harm. However, after losing 20-40 percent of the total blood volume, the person will start to feel anxious. The blood pressure will rise rapidly. When the blood loss exceeds the 40 percent mark, the person will feel lethargic and lose consciousness. The person will also experience severe shocks during this time. Blood loss may be due to internal or external bleeding.

The quantity of blood in the human body in litres is around 4.5 litres in the case of an adult. So one can donate up to one pint of blood. As a huge volume of blood is produced, the body can easily replace a small amount of lost or donated blood. 

Maintenance and Production of Blood 

The human body produces around 2 million red blood cells per second from the stem cells in the bone marrow. These stem cells produce RBCs and maintain the normal blood percentage in the human body. Apart from the RBCs, the white blood cells (WBCs) act as a defence mechanism of the body and platelets. The circulation and purification of the blood are carried out by the various cardiovascular systems. Plasma is an important component of the blood as it carries the RBCs, platelets and boosts the immune system.

Interesting Facts about Total Blood Volume in the Human Body 

• An adult body has 1,00,000 kilometres or 60,000 miles of blood vessels running throughout the body.

• Blood plasma makes up around 55% of the total volume of blood present in the human body.

• The average volume of blood present in an adult male body is 5.6 litres, while an adult female body contains 4.5 litres of blood.