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Hemoglobin is a protein found in red blood cells that plays a crucial role in transporting oxygen throughout the body. When you have your blood tested, the hemoglobin level is one of the most important measurements that healthcare providers look at to assess your overall health. Normal hemoglobin levels vary depending on age and gender, with adult men typically having levels between 13.5 and 17.5 grams per deciliter, while adult women usually have levels between 12.0 and 15.5 grams per deciliter. Children and pregnant women have different normal ranges that should be evaluated by a healthcare professional.

Low hemoglobin levels, a condition known as anemia, can result from various causes including iron deficiency, vitamin B12 or folate deficiency, chronic diseases, blood loss, or bone marrow problems. People with low hemoglobin may experience symptoms such as fatigue, weakness, pale skin, shortness of breath, dizziness, cold hands and feet, and irregular heartbeat. If your laboratory test shows low hemoglobin, your doctor will likely order additional tests to determine the underlying cause and recommend appropriate treatment, which may include dietary changes, supplements, or other medical interventions.

High hemoglobin levels are less common but can also indicate health concerns. Elevated hemoglobin may occur in people living at high altitudes, smokers, or those with certain medical conditions such as polycythemia vera, lung disease, heart disease, or dehydration. Some people may have naturally higher hemoglobin levels without any underlying health problems, but consistently elevated levels should be evaluated by a healthcare provider.

A hemoglobin test is typically performed as part of a complete blood count, which is one of the most commonly ordered laboratory tests. The test requires only a small blood sample, usually drawn from a vein in your arm. No special preparation is needed for this test in most cases, though you should inform your healthcare provider about any medications or supplements you are taking, as some substances can affect hemoglobin levels. Regular monitoring of hemoglobin levels is particularly important for people with chronic conditions, those undergoing certain treatments, pregnant women, and individuals with a history of anemia or blood disorders.