Blood banking and transfusion medicine involves blood transfusions, and gathering and storing blood products for future use. A blood banking/transfusion physician is a physician who is concerned with maintaining an adequate supply of blood for surgeries, the safety of blood donors and patients, and the appropriate distribution of blood products. Blood components include red blood cells, white blood cells, platelets and plasma. Both blood donors and patients need to be tested for blood type and antibodies for safety before any procedure.

Doctor density varies by specialty and location. The United States has 697 practicing blood banking / transfusion medicine doctors. Broken out by state, blood banking / transfusion medicine doctor density in Alabama is 6, in Alaska is 1, in Arizona is 5, in Arkansas is 6, in California is 82, in Colorado is 12, in Connecticut is 10, in Delaware is 1, in District of Columbia is 7, in Florida is 53, in Georgia is 12, in Hawaii is 2, in Idaho is 3, in Illinois is 37, in Indiana is 11, in Iowa is 6, in Kansas is 9, in Kentucky is 4, in Louisiana is 10, in Maine is 13, in Maryland is 20, in Massachusetts is 50, in Michigan is 26, in Minnesota is 24, in Mississippi is 4, in Missouri is 17, in Montana is 1, in Nebraska is 5, in Nevada is 5, in New Hampshire is 3, in New Jersey is 16, in New Mexico is 11, in New York is 80, in North Carolina is 23, in Ohio is 28, in Oklahoma is 8, in Oregon is 5, in Pennsylvania is 38, in Rhode Island is 3, in South Carolina is 5, in South Dakota is 2, in Tennessee is 13, in Texas is 63, in Utah is 11, in Vermont is 2, in Virginia is 30, in Washington is 10, in West Virginia is 4, in Wisconsin is 19, and in Wyoming is 1.