The American Red Cross asks eligible donors to help ensure blood is available for patients in need by giving blood in May before the busy summer season kicks in.Blood and platelet donations often decrease when regular donors are vacationing and school is out of session, but the need for blood is constant. Donors are needed in the weeks leading up to summer to help alleviate this seasonal decline. Donors of all blood types – especially those with types O negative, A negative and B negative – are needed to help ensure blood is available for patients this spring.