why do you pass out when giving blood

Blood donation has several benefits for those who have serious injuries and diseases. The Mayo Clinic reports that each blood donation can help up to three people since donor centers divide whole blood into platelets, red blood cells and plasma. Because donation involves the removal of blood from the circulatory system, some people pass out while giving blood or after the blood donation process. During the donation process, a phlebotomist or nurse inserts a needle into the vein of the donor. The collection process itself takes 8 to 10 minutes, according to the American Red Cross. Blood collection continues until 1 pint of blood has accumulated. After this procedure, the phlebotomist or nurse puts a bandage on the donor rsquo;s arm to stop any bleeding. During the blood collection process, blood volume decreases, causing a sudden drop in blood pressure. This sudden drop causes some people to pass out while they give blood. Sudden decreases in blood sugar level also cause fainting during blood donation. "Men rsquo;s Health" magazine indicates that blood donation also has an emotional component. During emotional stress, the body directs blood flow to the muscles to prepare for the flight or fight response to danger.


This diverts blood from the brain, increasing the risk that someone will pass out during the donation process. Some people experience symptoms before they pass out. The Heart Rhythm Society defines these symptoms as presyncope. Presyncope symptoms include sweating, nausea, lightheadedness, dizziness, abdominal discomfort, headache, confusion, heart palpitations and difficulty speaking. If you experience these symptoms while donating blood, notify a donation center professional immediately. Blood donors should take several steps to reduce the risk of passing out during the donation process. The American Red Cross recommends drinking plenty of fluids and maintaining a diet high in iron before a donation appointment. Drinking fluids will keep blood volume at normal levels, while iron consumption will counteract the loss of iron that occurs during donation. After giving blood, eat a snack that contains sugar to replace the blood sugar lost during the donation process. This will help prevent fainting after blood donation. Some people have an increased risk for passing out because of medical conditions that affect the heart, endocrine system and nervous system. These conditions include diabetes, hypoglycemia, anxiety, irregular heartbeat, panic disorders, heart blockages and dehydration.


Discuss your medical history with a physician or donation center representative to determine if blood donation is appropriate.
By pH health care professionals Fainting It can happen to otherwise healthy people! You may feel faint and lightheaded and then suddenly lose consciousness or pass out. The most common cause of fainting (especially among children and young adults) is, which is also commonly referred to as vasovagal syncope or a vasovagal response. In a vasovagal response, your blood pressure drops and the heart does not pump a normal amount of oxygen to the brain. The response is often triggered by anxiety or emotional distress, sometimes even from the sight of blood during a blood draw. This type of fainting can lead to minor injuries, like cuts or bruises from falling, but it is considered to be relatively harmless in most cases. your skin may become pale, you may feel lightheaded, start to lose some vision (tunnel vision) and/or experience blurred vision. You may feel nausea, warmth or a cold sweat. You may even start yawning. Other people in the room may notice your pupils becoming dilated or notice you making jerky movements.


You also might have a slow and weak pulse. So what steps can you take to prevent fainting during your blood draw? or at the onset of symptoms may help postpone or prevent fainting. You also may and elevate your legs. If you have fainted at a blood draw before, you should ask to do your next blood draw lying down. You can also Try not to skip meals. Don t fast for too long. Stay hydrated. Avoid standing for prolonged periods of time. Reduce caffeine and alcohol intake. Try sleeping with your legs elevated. Consider wearing elastic stockings to keep blood from pooling in your legs (which would reduce blood flow to your brain! ). Be proactive and talk to the nurse or phlebotomist before your blood draw and let him/her know if you have fainted before. Enjoy Your Healthy Life! The pH professional health care team includes recognized experts from a variety of health care and related disciplines, including physicians, attorneys, nutritionists, nurses and certified fitness instructors. This team also includes the members of the pH Medical Advisory Board, which constantly monitors all pH programs, products and services. To learn more about the pH Medical Advisory Board, click here.

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