This statistic comes from a survey conducted by the Bureau of Justice Statistics (BJS), a division of the U.S. Department of Justice, which found that on June 30, 2009, the United States housed 203,233 Federal prisoners, 1,326,547 State prisoners, and 767,620 detainees in local jails.
Doctors try to determine if a low red blood cell count is caused by increased blood loss of red blood cells or from decreased production of them in the bone marrow. Knowing whether the number of white blood cells and/or platelets has changed also helps determine the cause of anemia.
Low blood cell counts can cause problems such as anemia. 1  A catheter (thin tube) is placed in a large vein in the donorâs arm. 2  Blood travels through the catheter from the body to a special machine. The machine carries out a process called apheresis, which separates and collects stem cells from the blood.