A hemoglobin test measures the amount of hemoglobin in your blood.
Hemoglobin is a protein in your red blood cells that carries oxygen to your body's organs and tissues and transports carbon dioxide from your organs and tissues back to your lungs.
If a hemoglobin test reveals that your hemoglobin level is lower than normal, it means you have a low red blood cell count (anemia).
Anemia can have many different causes, including vitamin deficiencies, bleeding and chronic diseases.
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