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).
Checkup on Health. It is estimated that 85 percent of teens get acne, usually starting at age 11 for girls and a couple years later for boys. Donât let acne ruin those important teenage years. By Philina Lamb, M.D.hose who donât develop acne as a teenager are in a lucky minority. It is estimated that 85 percent of teens get acne, usually starting at age 11 for girls and a couple years later for boys.