A hemoglobin test measures the amount of hemoglobin in the blood. Hemoglobin is a protein in red blood cells responsible for carrying oxygen from the lungs to the rest of the body and returning carbon dioxide to the lungs for exhalation. This test is important for evaluating overall health and diagnosing conditions such as anemia. Low hemoglobin levels can be a sign of anemia, blood loss, or other health issues, while high levels might suggest dehydration or other conditions affecting red blood cell production.

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