The American Red Cross has a significant need for type O negative blood donors to donate blood for patients. Eligible donors with type O negative blood are encouraged to make a whole blood or double red cell donation, where available, through the Red Cross. During a double red cell donation, two units of red blood cells are collected while most of the plasma and platelets are returned to the donor. Blood donation appointments can be quickly and easily scheduled by using the Red Cross Blood Donor App, visiting redcrossblood.org or calling 800.RED.CROSS (800.733.2767). Those who come to donate now through May 15, will be entered to win four single-day tickets to any of 10 Cedar Fair theme parks in the U.S. For a full list of participating parks, visit redcross.cedarfair.com.