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. Shedding a details amount of blood will certainly not cause any type of harm come the body.

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According come an larger review post in an important Care, blood accounts for:

approximately 8–9% the a child’s body weightapproximately 9–10% of an infant’s body load

In this article, learn more about the median volume of blood in adults and also children. Learn, too, what causes blood loss, just how it influence the body, and also what to do if the happens.


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Share top top PinterestThe lot of blood in a who body deserve to vary according to your age and size.
According come a 2020 article, over there are about 10.5 pints (5 liters) that blood in the average person adult body, return this will vary depending upon various factors. Throughout pregnancy, a woman may have actually up to 50% much more blood.

The typical quantities that blood are::

about 9 pints (4.3 liters) the blood in an average-sized woman (5 feet 5 inch tall and also weighing 165 pounds)about 12.2 pints (5.7 l) in one average-sized male (6 feet in height and weighing 200 pounds)in an infant, about 1.2 liquid ounces (fl oz) because that every pound of body load (75 – 80 milliliters (ml) that blood every kilogram).in a child, around 1–1.2 fl oz for every pound of body load (70–75 ml the blood every kg)

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


Blood volume test

According come an older post in the newspaper of Nuclear medicine Technology, a blood volume test have the right to measure the lot of blood in a who body.

A doctor might use this check to assess a selection of conditions, such as:

There are various ways the testing, but a blood volume check usually requires injecting a little amount of a tracer substance right into the body. A healthcare skilled will then usage imaging technology to track blood moving approximately the body.


How lot blood can you lose or donate?

According come the American Red Cross, the standard amount that blood a human being will give throughout a blood donation is 1 pint. This is roughly 10% the the blood in the body and a for sure amount that blood to lose.

A human being may feel a little faint after ~ donating blood, and also so donation centers asking donors to rest for 10–15 minutes and also take some refreshments prior to leaving.

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

Donating blood can save lives, but how does it impact the donor?


Shock and blood loss

Severe bleeding have the right to be dangerous. In clinical terms, shock way that not sufficient oxygen is getting to tissues in the body. Low oxygen level can reason damage to the brain and other organs.

If someone is losing blood, the body will begin to straight blood toward the vital organs and away from the skin, fingers, and also toes. A human being may begin to look pale or feeling numbness in your extremities.

According come a 2019 article, as soon as a person loses around 15% of their blood volume, they deserve to start to experience shock, although their blood pressure and other indications will most likely be regular at this point.

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

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

Causes that bleeding and also shock

Bleeding have the right to be external or internal, yet both species can lead to shock.

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

Internal bleeding: An inner injury, such as a punch to the abdomen, deserve to lead come a sudden and far-ranging loss that blood, however this may not be clearly shows from the outside. The clinical testimonial in Critical Care shows that clinical conditions, such together a perforated ulcer, lung cancer, or a ruptured ovarian cyst, can additionally cause inner bleeding.

Depending on where interior bleeding occurs, bruising may start come appear. There may be a lose of blood v the mouth, nose, or other orifices.Learn the difference in between an artery and also a vein here.

Getting help

A human with significant bleeding will need clinical attention.

For exterior bleeding, the person should:

sit or lie downraise the hurt part, if possibleapply push to the wound to sluggish the bleeding or ask someone rather to perform this

Someone should speak to 911 if:

bleeding is severebleeding walk not stop or sluggish down on using pressuresevere bruising shows up on the human body or the headthere is a readjust in awareness or difficulty breathing

Transfusions

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

Possible reasons include:

losing a many blood

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


The human body makes approximately 2 million red blood cells per second. Blood cells build from stem cells in the bone marrow. Stem cells room a type of cell the can develop other cells. This process happens continually transparent a person’s life.

Blood is composed of various parts:

Red blood cells carry oxygen and also carbon dioxide.White blood cells help defend the human body against condition and infection.Platelets aid stop bleeding.

The Red Cross also state that body takes about 24 hrs to replace shed plasma, however 4–6 mainly to change red blood cells.

Red blood cells acquire their color from hemoglobin, which consists of iron. It have the right to take numerous months for iron levels to go back to normal after shedding or donating blood. The Office of diet Supplements note that constant donors may have low level of steel in your blood.

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

drinking lot of of fluids, specifically waterconsuming iron-rich foods, such together beef liver and fortified foods

Many civilization now donate plasma. Are there any risks?


The circulatory or cardiovascular device is responsible for relocating blood approximately the body. In ~ this system, the heart pumps the blood to the blood vessels, which supply blood to the body organs. There, the blood delivers oxygen and also other nutrients.

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Others systems and organs that play a critical role are:

the kidneys, which manage the liquid balance in the bodythe bones system, together bone marrow produce blood cellsthe concerned system, which allows the various other systems to accomplish their tasks

A difficulty with any kind of of these systems can affect blood flow and blood volume, the shipment of oxygen, and a person’s ability to survive.