<unk>  is the most common disorder of the blood.<unk> , from the Greek (Ἀναιμία) (an-haîma) meaning "without blood", is a deficiency of red blood cells (RBCs) and/or hemoglobin. This results in a reduced ability of blood to transfer oxygen to the tissues, causing tissue hypoxia. Since all human cells depend on oxygen for survival, varying degrees of<unk>  can have a wide range of clinical consequences. Hemoglobin (the oxygen-carrying protein in the red blood cells) must be present to ensure adequate oxygenation of all tissues and organs.
The three main classes of<unk>  include excessive blood loss (acutely such as a hemorrhage or chronically through low-volume loss), excessive blood cell destruction (hemolysis), or deficient red blood cell production (ineffective hematopoiesis). There are multiple subtypes of<unk>  within those major categories.<unk>  is defined as a hemoglobin concentration (Hb) of less than 12 g/dL in women and less than 13 g/dL in men, or alternatively, hematocrit of less than 36% in women and less than 40% in men.
Anemia
Analbuminaemia
Pancytopenia
Leukopenia
Polycythemia
Leukocytosis
Dyslipidemia
Microcytic anemia