Medically the evaluation by Deborah Weatherspoon, Ph.D., R.N., CRNA — composed by Claire Sissons — to update on June 7, 2020

The lot of blood in a person’s body will count on your age and also size. Losing a specific amount the blood will certainly not cause any type of harm to the body.

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According come an larger review write-up in critical Care, blood account for:

approximately 8–9% that a child’s human body weightapproximately 9–10% of an infant’s body weight

In this article, learn an ext about the median volume that blood in adults and children. Learn, too, what reasons blood loss, how it affect the body, and what to execute if that happens.

Share on PinterestThe amount of blood in a person’s body have the right to vary follow to your age and also size.
According come a 2020 article, over there are roughly 10.5 pints (5 liters) that blood in the average person adult body, back this will certainly vary depending on various factors. During pregnancy, a mrs may have up to 50% much more blood.

The mean quantities of blood are::

about 9 pints (4.3 liters) of blood in one average-sized woman (5 feet 5 inches tall and weighing 165 pounds)about 12.2 pints (5.7 l) in one average-sized masculine (6 feet in height and weighing 200 pounds)in one infant, around 1.2 liquid ounces (fl oz) for every lb of body weight (75 – 80 milliliters (ml) of blood per kilogram).in a child, around 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 up Anesthesia.

Blood volume test

According come an older short article in the newspaper of Nuclear medicine Technology, a blood volume test have the right to measure the lot of blood in a person’s body.

A doctor might use this test to evaluate a range of conditions, such as:

There are different ways of testing, however a blood volume check usually involves injecting a little amount the a tracer substance right into the body. A healthcare professional will then use imaging technology to monitor blood moving about the body.

How lot blood have the right to you lose or donate?

According to the American Red Cross, the typical amount of blood a person will give throughout a blood donation is 1 pint. This is roughly 10% the the blood in the body and also a for sure amount of blood to lose.

A human being may feeling a tiny faint after donating blood, and so donation centers questioning donors to remainder for 10–15 minutes and also take part refreshments prior to leaving.

If a human being has an illness or accident, they might lose much more blood. This can lead come shock, and also it deserve to be life threatening.

Donating blood can save lives, yet how go it impact the donor?

Shock and also blood loss

Severe bleeding have the right to be dangerous. In medical terms, shock means that not enough oxygen is reaching tissues in the body. Low oxygen levels can cause damage come the brain and various other organs.

If who is losing blood, the body will start to straight blood towards the an important organs and away indigenous the skin, fingers, and toes. A person may start to watch pale or feeling numbness in their extremities.

According come a 2019 article, once a human loses about 15% of your blood volume, they deserve to start to experience shock, although your blood pressure and also other indications will most likely be common at this point.

After shedding 20–40%, the who blood press will start to fall, and they will start to feeling anxious. If lock lose much more blood, castle will begin to feel confused. Your blood pressure might rise to about 120 beats every minute (bpm), together the human body tries to maintain blood supply to the crucial organs.

When blood ns is 40% or more, the human will be in serious shock. Your pulse price will climb over 120 bpm. They will certainly feel lethargic and also may lose consciousness.

Causes the bleeding and also shock

Bleeding have the right to be outside or internal, but both types can lead to shock.

External bleeding: Head wounds or a deep wound or a reduced on or near a vein, such as on the wrist or neck, can result in major blood loss.

Internal bleeding: An inner injury, such as a blow to the abdomen, deserve to lead to a suddenly and significant loss of blood, yet this might not be visible from the outside. The clinical testimonial in Critical Care suggests that medical conditions, such as a perforated ulcer, lung cancer, or a ruptured ovarian cyst, can also cause interior bleeding.

Depending ~ above where inner bleeding occurs, bruising may start to appear. There may be a loss of blood with the mouth, nose, or other orifices.Learn the difference between an artery and a vein here.

Getting help

A person with major bleeding will certainly need clinical attention.

For outside bleeding, the human should:

sit or lie downraise the hurt part, if possibleapply press to the wound to slow-moving the bleeding or asking someone else to do this

Someone should call 911 if:

bleeding is severebleeding walk not protect against or slow-moving down on using pressuresevere bruising shows up on the body or the headthere is a adjust in awareness or an obstacle breathing


A blood transfusion is a clinical procedure to donate blood to who who requirements it.

Possible reasons include:

losing a most blood

Blood transfusions have the right to be a life-saving procedure. People can likewise receive various other parts that blood, such as plasma and platelets, for miscellaneous treatment purposes.

The body makes approximately 2 million red blood cells every second. Blood cells develop from stem cell in the bone marrow. Stem cells are a form of cell that can develop other cells. This procedure happens continually throughout a who life.

Blood consists of different parts:

Red blood cells lug oxygen and also carbon dioxide.White blood cells aid defend the body against disease and infection.Platelets aid stop bleeding.

The Red Cross additionally state that body takes approximately 24 hrs to replace shed plasma, yet 4–6 weeks to replace red blood cells.

Red blood cells obtain their color from hemoglobin, which has iron. It deserve to take number of months because that iron level to return to normal after losing or donating blood. The Office of diet Supplements keep in mind that frequent donors may have actually low levels of stole in their blood.

People who have experienced blood loss as result of donation or another reason may benefit from:

drinking many of fluids, particularly waterconsuming iron-rich foods, such as beef liver and fortified foods

Many people now donate plasma. Are there any kind of risks?

The circulatory or cardiovascular mechanism is responsible for moving blood about the body. In ~ this system, the love pumps the blood come the blood vessels, which provide blood come the body’s organs. There, the blood delivers oxygen and other nutrients.

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Others systems and organs the play a an important role are:

the kidneys, which manage the fluid balance in the bodythe skeletal system, as bone marrow produces blood cellsthe worried system, which permits the other systems to meet their tasks

A trouble with any of these equipment can impact blood flow and also blood volume, the delivery of oxygen, and a person’s capacity to survive.