Why is Hb done?

• To detect anemia
• To detect Hb levels before and after blood transfusion
• To monitor the response to treatment of anemia or polycythemia
• If you have a family history of an inherited blood disorder
• In case of excessive blood loss from an injury or surgical procedure

What does Hb Measure?The hemoglobin test measures the amount of hemoglobin in the blood.

Hemoglobin (Hb) is a protein found in red blood cells (RBCs) that carries oxygen from the lungs to the body tissues, and to exchange the oxygen for carbon dioxide. Hemoglobin then carries the carbon dioxide back to the lungs and where it is exchanged for oxygen. Iron is an essential part of hemoglobin. Most blood cells, including red blood cells, are produced regularly in your bone marrow (present within the cavities of many of large bones). To produce hemoglobin and red blood cells, your body needs iron, vitamin B12, folate and other nutrients from the foods you eat.

A decrease in hemoglobin concentration in blood results in anemia. Anemia is a blood disorder characterized by a decrease in the total amount of red blood cells (RBCs) or hemoglobin in the blood or a lowered ability of the blood to carry oxygen to body organs and tissues. Anemia is the most common blood disorder, affecting about a third of the global population and can cause symptoms like tiredness (fatigue), weakness, shortness of breath etc.

The hemoglobin test is usually performed as a part of complete blood count (CBC) test.