Hemoglobin
Hemoglobin is a protein in red blood cells that carries oxygen from the lungs to tissues and carbon dioxide back. Low levels indicate anemia; high levels may suggest dehydration or polycythemia.
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Normal ranges
Men: 130–160 g/L. Women: 120–150 g/L.
Units: g/L
Causes of deviations
Low levels:
Iron deficiency anemia, blood loss, vitamin B12 deficiency, chronic disease.
High levels:
Dehydration, smoking, high altitude, polycythemia.
When to see a doctor
If levels are abnormal, or you have weakness, shortness of breath, or dizziness.
Related biomarkers
Panels
Cbc
Conditions
AnemiaIron deficiency
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