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.
Circulating lymphocytes are sometimes trapped in the lymph nodes or the spleen, causing a low lymphocyte count. Their numbers also are affected by the same factors that influence the total white blood count, such as autoimmune disorders (diseases that cause the body's immune system to attack normal body cells), infections, some cancers, and cancer treatments such as radiation and chemotherapy.