Blood makes up about 7% of our body weight. We collect 350ml from those who weigh 45-50kg and 450ml from anyone weighing above 50kg. 

Collecting less than 300ml of blood is insufficient and taking more than that from someone weighing less than 45kg may cause them to feel giddy. 

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This microsite is managed by the Singapore Red Cross, the national blood donor recruiter.
Please visit for more information.