Miller-Keystone Blood Center has issued an appeal for donors of all blood types.

Deb Otto, director of donor recruitment, said the center's inventory of red blood cells has reached critical levels.The ideal blood inventory on our shelves should be approximately 1,500 units. Currently about 700 units are on hand. O-negative blood units and A-positive blood units are particularly low, Otto said.Donors can find a blood drive on GIVEaPINT.org.In order to donate, people must be 17 years of age or older, weigh a minimum of 110 pounds and befeeling healthy; they must not have donated in the past eight weeks. All donors must also provide valididentification; ID must have the donor's name printed on it, as well as a photo and/or signature.For more information, call 1-800-B-A-DONOR (223-6667).