A negative
Around 7% of all Dutch people have blood type A negative. This doesn't mean you're less valuable. Your blood is still vital to a lot of people! Patients with blood type A and AB - positive or negative - can receive your red blood cells.
Women are allowed to give blood a maximum of three times a year, men up to five times a year. How often you are called upon depends on the blood group that is needed at a certain time. A patient preferably receives blood from his or her own blood group. Thus, a patient with blood group A negative preferably receives blood from an A negative blood donor. We therefore need all blood groups.