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why do you feel faint after giving blood

During a full blood donation, a person gives 450 ml of blood. That is about 10 percent of an adults blood volume. Giving this amount is safe and doesnt typically cause any ill effects. Infrequently (e. g. 1 percent of donations at our Blood Centre) the donor may experience side reactions during or after the donation: weakness, dizziness, cold sweat, fainting and other symptoms). Risks of adverse reactions can be increased by: emotional stress (anxiety about the procedure, seeing blood or other donors giving blood)
Fainting or a feeling of faintness or dizziness can be caused by a drop in blood pressure. Always make sure you are healthy, rested and have eaten before you give blood. Remember: to drink plenty of fluids before and after giving blood, including on the day after making a donation; to prefer lean and iron-rich food (red meat, liver, dark greens and colourful vegetables etc); if your blood pressure tends to be low, eat saltier food increase your salt intake before and after the donation, as this will help raise your blood pressure; to consume plenty of fluids after giving blood as well; the Blood Centre offers complimentary tea, coffee and juice.

And nibble on snacks sweet cookies and salty biscuits; to rest after giving blood, before you go on with your everyday activities, and let your body get used to the lower blood volume; its advisable to avoid strenuous physical exertion on the day of the donation and the following day (working out, saunas, swimming) on the day you give blood and the day after.

Fainting while giving blood is usually caused by psychological factors, however. To prevent this: the Blood Centre worker is by your side throughout the procedure and ready to help you if needed. Tensing your muscles also keeps blood pressure from dropping: squeeze a rubber ball, periodically contract your gluteal and leg muscles. After giving blood, you may feel faint if you stand up abruptly or if you have been standing for a long time. If you feel that you are getting weak, then to avoid fainting: do exercises using your muscles: cross your legs, tense your muscles all over your body or your gluteal muscles this will keep blood pressure from dropping; if possible. lie down and elevate your legs; consume salt (salty biscuits at the Blood Centre, salty meal after leaving the centre); consume fluids.

We hope that your donation is a pleasant experience and free of adverse effects. During a blood donation we take 470ml of blood, which is just under a pint. Your donation is transported to one of our blood centres where it is tested and processed before being issued to hospitals. If youвve ever wondered what happens to your blood donation. After donation, your body. What to do after donating blood? To help you stay well after you have given blood, we advise you to: keep the pressure dressing on your arm for about 30 minutes after you have given blood, and the plaster on for 6 hours If you need further advice or experience any prolonged after effects from your donation please ring 0300 123 23 23.

Feeling unwell after giving blood? If you (light headed or dizzy, hot, sweating, trembling, shaky or nauseous) lie down immediately, rest until you feel better and drink plenty of fluid. Any bruising is usually harmless and will disappear over time. Read more after donation. If bleeding recurs, sit down, raise your arm and press on the area where the blood is coming from for at least 5 minutes. If you become unwell (other than a cold or cold-sore) within 2 weeks following your donation, or if you believe there is a reason your blood should not be transfused to a patient, please call our donor helpline on 0300 123 23 23. Book your next blood donation or register as a new donor using our.

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