•  Hemoglobin (also called haemoglobin, abbreviated as Hb or Hgb) is the iron-containing protein in the red blood cells. This protein is originally responsible for the red color of blood and for the transport of oxygen by ferrous link in its molecule structure from lungs or gills to the rest of the body, where it releases the oxygen for cell use. Hemoglobin concentration measurement is one of the most commonly performed blood tests, usually as part of a complete blood count. The Hb concentration determines the oxygen-carrying capacity of the blood, higher or lower level of hemoglobin may cause severe complications.

 

  •  Anemia is a decrease in normal number of red blood cells (RBCs) or less than the normal quantity of hemoglobin in the blood, which means “poverty of blood”. Because hemoglobin normally carries oxygen from the lungs to the tissues, anemia leads to hypoxia (lack of oxygen) in organs. All human cells depend on oxygen for survival, and varying degrees of anemia can have a wide range of clinical consequences.