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Hemoglobin is a protein found in red blood cells that plays a vital role in transporting oxygen throughout the body. When hemoglobin levels fall below the normal range, a condition known as anemia develops. Anemia can result from various causes including nutritional deficiencies, chronic diseases, blood loss, or problems with red blood cell production. Common symptoms include fatigue, weakness, pale skin, shortness of breath, dizziness, and cold hands and feet. The severity of symptoms often depends on how low the hemoglobin levels have dropped and how quickly the anemia developed.

Laboratory testing for hemoglobin is typically performed as part of a complete blood count, which is one of the most commonly ordered blood tests. The test measures the amount of hemoglobin in your blood, usually expressed in grams per deciliter. Normal hemoglobin ranges vary by age and sex, with adult men generally having higher levels than adult women. Values below the normal range indicate anemia, while values above normal may suggest other conditions such as dehydration or certain blood disorders.

When anemia is detected through hemoglobin testing, additional laboratory tests are often needed to determine the underlying cause. These may include tests for iron levels, vitamin B12, folate, and other markers that help identify whether the anemia is due to nutritional deficiency, chronic disease, or other factors. A peripheral blood smear may also be examined to assess the size, shape, and appearance of red blood cells, which provides important clues about the type of anemia present.

Treatment for low hemoglobin depends entirely on the underlying cause identified through laboratory testing. Iron deficiency anemia may be treated with iron supplements, while vitamin deficiencies require appropriate vitamin replacement. More serious causes may require different interventions. Regular monitoring through repeat hemoglobin testing helps healthcare providers assess whether treatment is effective and adjust therapy as needed. Anyone experiencing symptoms of anemia should consult with their healthcare provider, who can order appropriate laboratory tests to evaluate hemoglobin levels and determine the best course of action.