What is the distribution of blood world wide?

Blood distribution worldwide varies significantly by region, influenced by population size, health policies, and local infrastructure. Generally, about 42% of the global population is eligible to donate blood, yet only about 1% actually donates each year. High-income countries tend to have more organized blood donation systems, while low-income countries often face challenges in maintaining sufficient blood supplies. The World Health Organization emphasizes the need for voluntary, unpaid donations to ensure safe and adequate blood availability.