So, although you donate less than a pint of blood at a time, almost half of this is water. That's why it is important for you to drink plenty of water before you donate and immediately after you've donated.
It's important to replace fluids after you've donated, to help bring your blood volume levels back to normal. The kidneys also play their part in controlling blood volume by regulating the amount of sodium and water lost in urine. Why not register to become a blood donor today? NHSBT uses cookies which are essential for the site to work.
We also use non-essential cookies to help us improve our services, any data collected is anonymised. By continuing to use this website you agree to our use of cookies. Read more about our cookies. Hi there, we see you're using OS , why not try our app? Skip to main content. Why give blood Demand for different blood types Blood types How blood is used Who you could help.
Who can give blood Can I give blood? Additional Donor Requirements. After You've Donated Blood. Can you explain the blood donation process? Are there any special instructions I should follow before donating whole blood? Does it hurt to donate blood? How long will it take to replenish the pint of blood I donate?
About Hosting Submit Hosting Form. Promotions Search Rewards Store. Milestone Store. All blood donors must wear a mask regardless of vaccination status. Paul Ramey August 09, As levels return to normal, any discomfort subsides. Oneblood Blog Subscribe to our blog to read inspiring stories and get the latest news. Follow on Twitter. Standing up too quickly, for example, can cause an abrupt drop in your blood pressure and make you feel light headed.
Lying on the couch restores blood flow to the brain as your head will be at the same level as your heart. Sitting on the edge of the donation bed with your feet hanging down for at least two minutes will also help, as it allows your blood pressure to stabilise itself before you stand up.
If you are feeling faint, our staff will ask you to stay at the session until you feel well again. How does the Body Replace Blood? About blood. Why Wait? Iron levels The body stores iron in the form of two proteins —ferritin in men it accounts for about 70 per cent of stored iron, in women 80 percent and haemosiderin. Drink up Blood volume makes up approximately eight per cent of your body weight. Feeling faint After donation some people can feel faint.
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