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Jan 12, 2024 · Generally, typical amounts of blood are: Adult male weighing about 200 pounds and at about 6 feet tall has an estimated 5.7 liters (5,700 milliliters), or 12 pints, of blood volume (an average 75 milliliters per kilogram).
- Overview
- How much blood can you lose?
- Why and how would your doctor measure your blood volume?
The amount of blood in your body is generally equivalent to 7% of your body weight. But this is an estimate because it can depend on your sex, where you live, and other factors.
The estimates for blood volume are as follows:
•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 people: To support their growing babies, pregnant people 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.
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 blood pressure and heart rate will stay close to normal as you lose up to 30 percent of your blood, or up to 1,500 mL of blood (0.4 gallons). After losing this amount of blood, you will experience the following:
•You’ll start to have a rapid heart rate higher than 120 beats per minute.
•Your blood pressure will drop.
•Your breathing rate will go up.
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.
- Rachel Nall, MSN, CRNA
Aug 28, 2024 · There are around 10.5 pints of blood in the average human adult body, but this can vary based on factors such as a person’s age and size. It accounts for around 7–8% of an adult’s body...
- Claire Sissons
This blood calculator helps you answer to how much blood is in the human body, more precisely in your own body depending on the height and weight. Discover more about the Nadler Method and on the blood composition below the form.
Jul 29, 2024 · A person's age, sex, body size and overall health all factor into their overall blood volume. On average, though, the adult human body contains around 10.5 pints of blood. Put another way, that's about five liters or 1.3 gallons.
The average human adult has about 8-10 pints of blood in the body, which is 8% of total body weight. A pint of blood is equivalent to 473.18 mL. Blood is connective tissue fluid that flows through arteries and veins, providing body tissues with oxygen and nutrition necessary for their survival.
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Jul 25, 2022 · In adults, blood contains about 0.8 gallons (3 liters) of plasma, red blood cells, white bloods cells and platelets. Vitamins, electrolytes and other nutrients are dissolved in the blood,...
