How many times a year can a healthy person donate blood?

In general, FDA and AABB guidelines allow volunteer blood donations if someone is 17 years of age or older, weigh 100 lbs or more, and are in good health. Specific eligibility questions must be answered, a mini-physical preformed, and the prospective donor must have a blood count of 38% or higher (or a hemoglobin of 12.5 or greater). Specific criteria may be found at AABB.org.