Is one blood type worth more in donations?

Yes, in general, type O negative blood is considered to be the most valuable and the most in-demand blood type. This is because O negative blood is compatible with all other blood types, making it a universal donor. In emergency situations or when blood type is unknown, O negative blood can be transfused to any patient. For these reasons, O negative blood is often referred to as the "universal donor" blood type.

In most countries, there is a constant demand for O negative blood, and blood banks actively encourage people with this blood type to donate regularly. However, due to its high demand and relatively low frequency in the population (only about 7% of the population has O negative blood), it can sometimes be in short supply.