Polycythemia (also known as polycythaemia or polyglobulia) is a disease state in which the proportion of blood volume that is occupied by red blood cells increases. Blood volume proportions can be measured as hematocrit.It can be due to an increase in the number of red blood cells (absolute polycythemia) or to a decrease in the volume of plasma (relative polycythemia).lood volume proportions can be measured as hematocrit. It can be due to an increase in the number of red blood cells (absolute polycythemia) or to a decrease in the volume of plasma (relative polycythemia).
1 Some 20% of adolescents with major depression develop bipolar disorder within five years of the onset of depression. ( 2 Birmaher, B., Childhood and Adolescent Depression: A Review of the Past 10 Years.. 3  Part I, 1995).
One in 17âabout 13.6 millionâlive with a serious mental illness such as schizophrenia, major depression or bipolar disorder. 1 ï· Approximately 20 percent of youth ages 13 to 18 experience severe mental disorders in a given year. For ages 8 to 15, the estimate is 13 percent.ne in 17âabout 13.6 millionâlive with a serious mental illness such as schizophrenia, major depression or bipolar disorder. 1 ï· Approximately 20 percent of youth ages 13 to 18 experience severe mental disorders in a given year. For ages 8 to 15, the estimate is 13 percent.