How much blood does a child have

How Much Blood Is in the Human Body?

Medically reviewed by Debra Sullivan, Ph.D., MSN, R.N., CNE, COI — By Rachel Nall, MSN, CRNA — Updated on July 18, 2017

Overview

The amount of blood in the human body is generally equivalent to 7 percent of body weight. The average amount of blood in your body is an estimate because it can depend on how much you weigh, your sex, and even where you live.

Babies: Babies born full-term have about 75 milliliters (mL) of blood per kilogram of their body weight. If a baby weighs about 8 pounds, they’ll have about 270 mL of blood in their body, or 0.07 gallons.
Children: The average 80-pound child will have about 2,650 mL of blood in their body, or 0.7 gallons.
Adults: The average adult weighing 150 to 180 pounds should have about 1.2 to 1.5 gallons of blood in their body. This is about 4,500 to 5,700 mL.
Pregnant women: To support their growing babies, pregnant women usually have anywhere from 30 to 50 percent more blood volume than women who are not pregnant. This is about 0.3 to 0.4 additional gallons of blood.

Sometimes the amount of blood in the human body can differ based on where you live. For example, people who live at high altitudes have more blood because there isn’t as much oxygen at higher altitudes.

If you lose too much blood, your brain doesn’t get enough oxygen to support life. People who experience major injury and trauma, such as a car accident, may lose blood very quickly. Losing an excessive amount of blood is known as hemorrhagic shock. Doctors categorize hemorrhagic shock into four classes based on how much blood is lost. In class IV, the amount of blood loss can be fatal.

Here are the classes of hemorrhagic shock:

Your doctor won’t usually directly measure the amount of blood that you have because they can estimate it based on other factors and tests. For example, a blood test known as a hemoglobin and hematocrit test can estimate how much blood is in your body compared with the amount of fluid in your body. Then, your doctor can consider your weight and how hydrated you likely are. All of these factors can indirectly measure how much blood volume you have.

If you experience a major trauma that causes blood loss, doctors will usually use your weight as the starting point to guess how much blood you have. They will then use factors like your heart rate, blood pressure, and breathing rate to estimate how much blood may have been lost. They’ll also try to keep track of any additional blood loss so they can quickly replace it with a blood transfusion.

Read more: How to lower your heart rate »

Last medically reviewed on July 18, 2017

How we reviewed this article:

Healthline has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical associations. We avoid using tertiary references. You can learn more about how we ensure our content is accurate and current by reading our editorial policy.

Gender differences in blood contents. (2016).
sydney.edu.au/science/biology/learning/blood_composition/Gender.shtml
Gutierrez G, et al. (2004). Clinical review: Hemorrhagic shock.
ncbi.nlm.nih.gov/pmc/articles/PMC1065003/
Riley MR. (2015). Maternal cardiovascular and hemodynamic adaptations to pregnancy.
uptodate.com/contents/maternal-cardiovascular-and-hemodynamic-adaptations-to-pregnancy

Our experts continually monitor the health and wellness space, and we update our articles when new information becomes available.

Share this article

Medically reviewed by Debra Sullivan, Ph.D., MSN, R.N., CNE, COI — By Rachel Nall, MSN, CRNA — Updated on July 18, 2017

How Much Blood Is in the Human Body?

Medically reviewed by Debra Sullivan, Ph.D., MSN, R.N., CNE, COI — By Rachel Nall, MSN, CRNA — Updated on July 18, 2017

Overview

Babies: Babies born full-term have about 75 milliliters (mL) of blood per kilogram of their body weight. If a baby weighs about 8 pounds, they’ll have about 270 mL of blood in their body, or 0.07 gallons.
Children: The average 80-pound child will have about 2,650 mL of blood in their body, or 0.7 gallons.
Adults: The average adult weighing 150 to 180 pounds should have about 1.2 to 1.5 gallons of blood in their body. This is about 4,500 to 5,700 mL.
Pregnant women: To support their growing babies, pregnant women usually have anywhere from 30 to 50 percent more blood volume than women who are not pregnant. This is about 0.3 to 0.4 additional gallons of blood.

Here are the classes of hemorrhagic shock:

Read more: How to lower your heart rate »

Last medically reviewed on July 18, 2017

How we reviewed this article:

Gender differences in blood contents. (2016).
sydney.edu.au/science/biology/learning/blood_composition/Gender.shtml
Gutierrez G, et al. (2004). Clinical review: Hemorrhagic shock.
ncbi.nlm.nih.gov/pmc/articles/PMC1065003/
Riley MR. (2015). Maternal cardiovascular and hemodynamic adaptations to pregnancy.
uptodate.com/contents/maternal-cardiovascular-and-hemodynamic-adaptations-to-pregnancy

Our experts continually monitor the health and wellness space, and we update our articles when new information becomes available.

Share this article

Medically reviewed by Debra Sullivan, Ph.D., MSN, R.N., CNE, COI — By Rachel Nall, MSN, CRNA — Updated on July 18, 2017

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Peculiarities of taking blood from children

May 15, 2020
Author: Galina Rogova

Taking blood from children

The younger the child, the more difficult it is for him to describe his feelings and localize the pain. Parents often show concern only in case of a decrease in the activity of the child, loss of appetite, and a rise in body temperature. On the other hand, most childhood diseases are reflected in changes in blood counts, which, together with an examination and assessment of the child's condition, will allow the doctor to make a correct diagnosis.

However, taking blood from children for analysis is quite difficult both technically and psychologically. Difficulties are associated both with compliance with the requirements for preparation for research, and with the procedure itself.

The main difficulties are associated with obtaining a sufficient volume of blood, especially in children of the first three years of life. Their capillary network is poorly developed, the vessels and their lumen are small, and the blood has an increased viscosity, because. contains a high concentration of cells. The maximum volumes of blood that can be taken from a child at one time mainly depend not on age, but on his weight (table 1). Unreasonably frequent and extensive studies lead to a change in blood parameters (decrease in hemoglobin, hematocrit, erythrocytes, etc.) without a pathological cause.

The disadvantages of capillary blood sampling are associated with a greater likelihood of distorting the results or the need for re-sampling. This is due to:

destruction of blood cells during collection,
formation of microclots in the sample,
presence in the sample of interstitial fluid,
contamination of the sample with skin microflora,
short sample shelf life.

It is important to understand that blood sampling from a vein is less painful than blood sampling "from a finger" and is devoid of the negative effects described above. To facilitate the collection of venous blood, the child must be warm, parents rhythmically squeeze and unclench the child's wrist to facilitate blood flow. The child should get used to the room and calm down. It is advisable to give him 50-100 ml of clean water without gas for half an hour before taking blood. Try to take blood samples in the morning, 4-6 hours after a light breakfast in the morning.

WHO does not recommend more than two attempts to take venous blood in children and newborns. If for some reason it was not possible to carry out blood sampling, depending on the criticality of obtaining test results, it is worth postponing it for the next day.

For blood sampling in children from a vein, the same test tubes are used as in adults. The volume of each tube is 4-5 ml. In departments of newborns and young children, special pediatric test tubes are used with the same fillers as regular test tubes, but with a volume of 1-2 ml.

Patient's weight, kg

The maximum rate of blood sampling for 1 time, ml

The maximum rate of blood sampling for the entire period of hospitalization, ml

2. 7–3.6