When anemia mentioned to the public the first think will come to the mined is "poor blood" or "deficiency in blood." Or further may be "not enough iron." But this is not exactly the matter.

Anemia signifies a decrease in Hb or Hct concentration. It is a sign of an underlying disease rather than a specific diagnosis. In general, An Hb 13.5 g/dl in a male or 12.5 g/dl in an adult women is considered anemia. There is many kind of anemia based into the etiology of the disease. Anemia is an expression of many pathologic conditions and is not itself a disease state but a clinical sign of such disorders. Therefore, analysis of any anemia should follow a tripartite logical pathway: (1) seek mechanisms by which the anemia occurs, such as bleeding, lack of red cell production, or excessive red cell destruction; (2) identify associated diseases that cause anemia; (3) evaluate morphologically the peripheral blood smear

Definition of Anemia:
Anemia represents a decrease in red cell mass or hemoglobin contents of blood below physiologic need as set by tissue oxygen demand

The conventional content of blood below physiologic need as set by tissue oxygen demand. The conventional limits for normal range of hemoglobin represent the values obtained for 95 per cent of a normal, healthy population, assuming a normal distribution of individuals. In Physiologic terms, different ranges exist for men and women, for infants and growing children, and for different metabolic states.