The corporeality of blood in a person'due south body will depend on their age and size. Losing a sure amount of blood will non crusade whatsoever harm to the torso.

According to an older review article in Critical Care, claret accounts for:

  • approximately 7–8% of an adult's body weight
  • approximately 8–nine% of a child'due south body weight
  • approximately 9–10% of an baby's torso weight

In this article, learn more about the average volume of blood in adults and children. Learn, besides, what causes blood loss, how it affects the body, and what to do if it happens.

a woman having a blood test and wondering How much blood is in the human body Share on Pinterest
The corporeality of blood in a person's body can vary co-ordinate to their age and size.

According to a 2020 commodity, there are around ten.5 pints (v liters) of blood in the average human being adult torso, although this will vary depending on various factors. During pregnancy, a adult female may have upwardly to fifty% more claret.

The average quantities of claret are::

  • about 9 pints (four.3 liters) of claret in an average-sized female (v feet 5 inches tall and weighing 165 pounds)
  • nearly 12.2 pints (5.7 l) in an average-sized male person (6 feet in tiptop and weighing 200 pounds)
  • in an baby, virtually 1.2 fluid ounces (fl oz) for every pound of torso weight (75 – 80 milliliters (ml) of blood per kilogram).
  • in a child, about 1–1.2 fl oz for every pound of body weight (70–75 ml of blood per kg)

For clarity, Medical News Today has converted these figures from the formula given in Open Anesthesia.

According to an older commodity in the Journal of Nuclear Medicine Applied science, a blood volume exam can measure the amount of blood in a person'southward body.

A doctor may use this test to assess a variety of conditions, such as:

  • congestive heart failure
  • kidney failure
  • daze

There are dissimilar ways of testing, but a blood volume test usually involves injecting a small amount of a tracer substance into the body. A healthcare professional will and then use imaging technology to track blood moving around the body.

According to the American Red Cross, the standard amount of claret a person will requite during a claret donation is 1 pint. This is effectually 10% of the blood in the body and a safe corporeality of blood to lose.

A person may experience a fiddling faint subsequently donating claret, so donation centers enquire donors to rest for 10–15 minutes and accept some refreshments earlier leaving.

If a person has an illness or accident, they may lose more blood. This can lead to shock, and it can be life threatening.

Donating blood can save lives, simply how does information technology affect the donor?

Severe haemorrhage can be dangerous. In medical terms, shock means that non plenty oxygen is reaching tissues in the torso. Low oxygen levels can cause damage to the brain and other organs.

If someone is losing blood, the body volition start to direct claret toward the vital organs and away from the skin, fingers, and toes. A person may begin to look pale or feel numbness in their extremities.

Co-ordinate to a 2019 article, when a person loses around fifteen% of their claret volume, they can start to experience daze, although their blood pressure level and other signs will likely be normal at this point.

Afterward losing 20–40%, the person'south blood pressure will outset to fall, and they will begin to feel anxious. If they lose more blood, they volition get-go to feel confused. Their claret pressure may rise to around 120 beats per minute (bpm), equally the body tries to maintain blood supply to the vital organs.

When claret loss is forty% or more, the person will be in severe shock. Their pulse rate volition rise over 120 bpm. They will feel lethargic and may lose consciousness.

Causes of bleeding and stupor

Bleeding can be external or internal, but both types can lead to shock.

External bleeding: Head wounds or a deep wound or a cut on or near a vein, such equally on the wrist or neck, can upshot in severe blood loss.

Internal bleeding: An internal injury, such as a blow to the belly, can lead to a sudden and significant loss of blood, only this may not be visible from the exterior. The clinical review in Disquisitional Intendance indicates that medical conditions, such equally a perforated ulcer, lung cancer, or a ruptured ovarian cyst, tin also cause internal bleeding.

Getting help

A person with severe bleeding will need medical attention.

For external haemorrhage, the person should:

  • sit or lie down
  • raise the injured part, if possible
  • use force per unit area to the wound to slow the bleeding or ask someone else to exercise this

Someone should telephone call 911 if:

  • bleeding is severe
  • bleeding does not stop or slow downwards on applying pressure
  • severe bruising appears on the body or the caput
  • there is a change in consciousness or difficulty breathing

Transfusions

A blood transfusion is a medical process to donate blood to someone who needs it.

Possible reasons include:

  • losing a lot of claret
  • having an illness that affects the blood, such as cancer or anemia

Blood transfusions tin exist a life-saving process. People can also receive other parts of blood, such as plasma and platelets, for various treatment purposes.

The body makes around two meg red blood cells per second. Blood cells develop from stem cells in the bone marrow. Stem cells are a type of prison cell that tin create other cells. This process happens continually throughout a person's life.

Claret consists of unlike parts:

  • Red blood cells acquit oxygen and carbon dioxide.
  • White blood cells help defend the body against illness and infection.
  • Platelets help stop bleeding.
  • Plasma carries claret cells, platelets, and other components and supports the allowed system. The American Cerise Cantankerous state that it makes up 55% of blood and is 92% water.

The Red Cross as well state that body takes effectually 24 hours to supplant lost plasma, merely 4–6 weeks to replace red blood cells.

Cerise blood cells become their colour from hemoglobin, which contains iron. It tin take several months for iron levels to return to normal subsequently losing or donating claret. The Role of Dietary Supplements note that frequent donors may have low levels of iron in their blood.

People who have experienced blood loss due to donation or another reason may benefit from:

  • drinking plenty of fluids, especially water
  • consuming iron-rich foods, such equally beef liver and fortified foods

Many people now donate plasma. Are there any risks?

The circulatory or cardiovascular organisation is responsible for moving blood effectually the body. Within this organisation, the heart pumps the blood to the blood vessels, which evangelize blood to the torso's organs. There, the claret delivers oxygen and other nutrients.

Others systems and organs that play a crucial role are:

  • the kidneys, which regulate the fluid rest in the body
  • the skeletal system, as bone marrow produces blood cells
  • the nervous arrangement, which enables the other systems to fulfill their tasks

A problem with any of these systems can touch blood catamenia and blood volume, the commitment of oxygen, and a person'south ability to survive.

What are the different blood types, and why does it matter?

Effectually vii–viii% of an adult's trunk weight is blood. The trunk can easily supervene upon a small amount of lost blood, which makes claret donation possible.

If a person loses around 15% or more of their blood, in that location may exist a take a chance of shock. Anyone who has signs of significant internal or external haemorrhage should seek immediate medical help.