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Jan 12, 2024 · The amount of blood in the human body varies based on age, weight, and sex. An adult male weighing about 200 pounds can have almost 6 liters, or a little over 12 pints, of blood while an adult female weighing about 165 pounds might have 4.3 liters, or about 9 pints, of blood.
- 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
What do blood cells do? The main function of red blood cells, or erythrocytes, is to carry oxygen from the lungs to the body tissues. And to carry carbon dioxide as a waste product away from the tissues and back to the lungs. Hemoglobin is an important protein in red blood cells that carries oxygen from the lungs to all parts of the body. The ...
The adult human body contains approximately 5 liters (5.3 quarts) of blood; it makes up 7 to 8 percent of a person's body weight. Approximately 2.75 to 3 liters of blood is plasma and the rest is the cellular portion.
- A normal platelet count ranges from 150,000 to 450,000 platelets per microliter of blood. More than 450,000 indicates a condition called thrombocyt...
- The primary function of red blood cells is to transport oxygen from the lungs to the rest of the body. They also help to remove carbon dioxide (CO2...
- Blood is a mixture of two components: cells and plasma. The cellular portion of blood contains red blood cells, white blood cells, and platelets wh...
- The eight most common blood types are A+, A-, B+, B-, O+, O-, AB+, AB-.
- Platelets help blood to clot by forming something called a platelet plug. When they recognize damaged blood vessels in an area of the body, they bi...
The average human adult has more than 5 liters (6 quarts) of blood in his or her body. Blood carries oxygen and nutrients to living cells and takes away their waste products. It also delivers immune cells to fight infections and contains platelets that can form a plug in a damaged blood vessel to prevent blood loss.
- Laura Dean
- 2005
- 2005
Jul 29, 2024 · How Many Pints of Blood Are in the Human Body? The amount of blood in the human body does, of course, depend on the human! 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 ...
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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 weight.
