Medically the review by Debra Sullivan, Ph.D., MSN, R.N., CNE, COI — created by Rachel Nall, MSN, CRNA — to update on July 18, 2017

You are watching: What is the blood volume of an average sized adult male

Overview

The amount of blood in the human being body is generally equivalent to 7 percent of body weight. The mean amount that blood in her body is one estimate because it deserve to depend on how much you weigh, her sex, and also even wherein you live.

Babies: Babies born full-term have around 75 milliliters (mL) that blood every kilogram of your body weight. If a baby weighs about 8 pounds, they’ll have around 270 mL that blood in their body, or 0.07 gallons. Children: The typical 80-pound kid will have about 2,650 mL that blood in your body, or 0.7 gallons. Adults: The mean adult weighing 150 come 180 pounds have to have about 1.2 to 1.5 gallons of blood in their body. This is about 4,500 come 5,700 mL. Pregnant women: To assistance their farming babies, pregnant women usually have almost everywhere from 30 to 50 percent more blood volume than ladies who room not pregnant. This is about 0.3 come 0.4 extr gallons the blood.

Sometimes the quantity of blood in the person body deserve to differ based upon where girlfriend live. For example, civilization who live at high altitudes have much more blood because there isn’t as lot oxygen at greater altitudes.

If you lose too lot blood, your mind doesn’t get sufficient oxygen to assistance life. World who experience major injury and trauma, such together a automobile accident, may shed blood really quickly. Shedding an extreme amount the blood is known as hemorrhagic shock. Doctors categorize hemorrhagic shock into four classes based upon how much blood is lost. In class IV, the lot of blood loss deserve to be fatal.

Here room the class of hemorrhagic shock:

 class I class II class III class IV blood loss (mL) up to 750 750 to 1,000 1,500 come 2,000 greater than 2,000 blood lose (% that blood volume) up come 15 15 come 30 30 to 40 greater than 40 pulse price (per minute) less than 100 100 to 120 120 to 140 greater 보다 140 blood pressure normal or increased decreased decreased decreased respiratory price (per minute) 14 come 20 20 to 30 30 to 40 greater than 35 urine output (mL every hour) greater than 30 20 to 30 5 to 15 negligible mental status slightly anxious mildly anxious anxious, confused confused, lethargic

Your blood pressure and heart price will remain close to common as you lose up come 30 percent of her blood, or approximately 1,500 mL that blood (0.4 gallons). After losing this quantity of blood, you will experience the following:

You’ll begin to have actually a fast heart rate greater than 120 beats every minute.Your blood pressure will drop.Your breathing rate will walk up.

If friend lose an ext than 40 percent of your blood, you will certainly die. This is around 2,000 mL, or 0.53 gallons of blood in the mean adult.

It’s vital to gain to a hospital to begin receiving blood transfusions to prevent this.

Your physician won’t usually directly measure the quantity of blood that you have because they can estimate it based on other factors and also tests. Because that example, a blood test well-known as a hemoglobin and also hematocrit test deserve to estimate just how much blood is in her body compared with the lot of liquid in her body. Then, your medical professional can take into consideration your weight and how character language you most likely are. All of these determinants can indirectly measure just how much blood volume you have.

If you suffer a significant trauma that causes blood loss, physicians will generally use her weight together the starting point to guess exactly how much blood you have. They will certainly then use factors like her heart rate, blood pressure, and breathing price to estimate how much blood may have actually been lost. They’ll also try to keep track of any additional blood loss therefore they can easily replace it through a blood transfusion.