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Hemoglobin is a vital protein found in red blood cells that carries oxygen from the lungs to all tissues and organs throughout the body. It also helps transport carbon dioxide back to the lungs for exhalation. The hemoglobin test measures the amount of this protein in your blood and is one of the most commonly performed laboratory tests. This test is typically part of a complete blood count, which provides important information about your overall health and can help detect various medical conditions.

Healthcare providers order hemoglobin tests for many reasons. The test is used to screen for, diagnose, or monitor conditions that affect red blood cells, such as anemia or polycythemia. Anemia occurs when hemoglobin levels are too low, which can cause fatigue, weakness, and shortness of breath because your body is not getting enough oxygen. Polycythemia is the opposite condition, where hemoglobin levels are too high, which can make blood thicker and increase the risk of blood clots. The test may also be ordered before surgery, during pregnancy, or as part of routine health checkups to establish baseline values.

The hemoglobin test requires a small blood sample, usually drawn from a vein in your arm. No special preparation is typically needed before the test, though your healthcare provider will inform you if fasting or other preparations are necessary. The blood draw takes only a few minutes and carries minimal risks, such as slight bruising or soreness at the puncture site. In some cases, a fingerstick sample may be used for quick screening, though a venous blood sample provides more accurate results.

Normal hemoglobin levels vary depending on age, sex, and other factors. For adult men, normal ranges are typically between 13.5 to 17.5 grams per deciliter, while for adult women, normal ranges are usually 12.0 to 15.5 grams per deciliter. Children and pregnant women have different reference ranges. Low hemoglobin levels may indicate anemia caused by iron deficiency, vitamin deficiencies, blood loss, chronic diseases, or bone marrow problems. High hemoglobin levels might suggest dehydration, lung disease, heart disease, or living at high altitudes. If your results are abnormal, your healthcare provider may order additional tests to determine the underlying cause and recommend appropriate treatment.