Your Complete Guide to Being Well and Staying Healthy
Today's Interactive Tools and Multimedia
Health Tip of the Day
Typing Your Blood
Your blood type falls in one of four categories: A, B, O or AB. According to the American Red Cross, the largest group is the type O, with about 45 percent of Americans falling into this category. The next largest is type A, at 40 percent. Type B is about 11 percent of the population, and type AB is 4 percent.