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One pint: Dizzness and headache for a day Two pints: Lasting dizziness and headache for a couple days. If I'm wrong, let me know. The funny thing is I was eager to find an answer for this question too. Not just someone's guess but from a medical student or professional. ------------------------------------------------------ The question is asked in a very open way, which makes it hard to answer with brevity. FOr instance, the primary symptom of bleeding is, well, blood -- someplace where it shouldn't be. Ans this symptom can be confirmed instantly, far before bloodloss would endanger the usual patient. The second difficulty relates to the condition of the patient before the bloodloss occurs, as well as the rapidity of the loss. A large patient (say 180lbs) can, depending on the person and the circumstances, part with as little as a quarter unit or as much as about 1 unit before some symptoms are visible. I should also add that the patient's activities post blood loss are important as well. I healthy blood donor can donate a unit, then lie down with a cookie and some OJ, and feel no apparentl ill effects. The same man, running a marathon at the time, will be in extremis. Then there's shock. An otherwise minor wound that shows a lot fo bleeding can induce shock in the patient -- and even in other patients (and observers!) who see it. Scalp wounds are famous for this. Then there's the different between blood volume (or how much blood and serum are in the circulatory system) and hemoglobin/hematocrit (how much O2 can be carried and how much space there is between red corpuscles). Bleeding causes problems with all three, and which becomes the most dangerous depends on the patient's condition before the event -- both immediately and chronically. In short, there's no real way to answer this question concisely without taking a myriad of other factors into account. That said, for a healthy human, you'll usually see effects after a unit, stronger effects after 2-3 units, and after that a need to resanguinate.

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14y ago
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13y ago

The average healthy person has approximately 6 litres / 12 pints of blood - loss of one third, (1/3), of the total blood volume is fatal. Therefore I would say that a loss of about a litre / 2 pints would render a healthy person unconscious.

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11y ago

I lost 2quarts the other week and got one. I think it would depend on blood pressure, how fast you are loosing blood, if they can't get the bleeding to stop. Stuff like that. Hope it helped

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Q: How much blood can someone lose before fainting?
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Related questions

What cause Fainting?

Most commonly a sudden drop in blood pressure causes fainting. Blood stops reaching places it should be - like your brain - and you lose consciousness. Extreme conditions are also a cause, such as too much heat, a stressful situation, fatigue, dehydration and hunger etc


Does fainting make you lose brain cells?

no i dont think so. you feel weak after getting up from fainting


How much blood do you have to lose before your eyesight goes?

I say you would have to lose half of your blood to lose consencnes, not sure about eyesight


How many pints of blood can someone lose before they become unconcious?

after losing between 25% - 40% of total blood volume. There's a whole host of variables that affect when exactly a person will start to lose consciousness due to blood loss.


How many pints of blood can a person lose before dying?

You can lose 4 pints of blood after that you're dead.


What do red blood cells lose before they enter the blood stream?

their color


How much blood do you lose before deteriorating?

All of it


How much blood can a snake lose before it dies?

100 liters


How much blood can a horse lose before dying?

40% of its blood volume, approximately 40 pints.


How much blood can a child lose before going into shock?

about 50% or more


What happens when you faint?

The medical term for fainting is syncope. (See related link.) Generally, fainting is merely a temporary loss of consciousness. Generally, this is a consequence of a temporary drop in blood flow to the brain and lasts a few minutes. When you faint, you lose consciousness (People say you "black out.") and lose muscle tone for a short time and then recover spontaneously when blood flow and blood pressure return to normal. Generally, there are no long term effects if there are no complicating factors of an injury or disease state. There are many possible causes of fainting varying from momentary changes of blood pressure under stress to serious chronic disease states. (See related link.)


What happens if you lose one of the 7 treasures while fainting in the dungeon?

simple go back and get another