Community Blood Services of Illinois said type O and type B red cells, along with all types of platelet products, are the most urgently needed before July 4. URBANA — Two blood products used by area hospitals are at critically low levels, and donors are needed especially in the days before the July 4 holiday, according to Community Blood Services of Illinois. The agency called on all eligible donors to step up, saying the supplies of type O and type B red cells have reached critical levels. read more