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Hemoglobin is a crucial protein found in red blood cells that carries oxygen throughout the body. When hemoglobin levels are too low, a condition called anemia develops, which can cause fatigue, weakness, and other health problems. Laboratory testing for hemoglobin is one of the most common blood tests performed and provides essential information about a person's overall health status and oxygen-carrying capacity.

A hemoglobin test measures the amount of hemoglobin in your blood, typically expressed in grams per deciliter. Normal hemoglobin levels vary by age and gender. For adult men, normal values generally range from 13.5 to 17.5 grams per deciliter, while adult women typically have levels between 12.0 and 15.5 grams per deciliter. Children and pregnant women have different reference ranges. The test is usually performed as part of a complete blood count, which also measures other blood components like red blood cells, white blood cells, and platelets.

Low hemoglobin levels can result from various conditions including iron deficiency, vitamin B12 or folate deficiency, chronic diseases, blood loss, bone marrow disorders, or certain medications. High hemoglobin levels are less common but may indicate dehydration, lung disease, heart disease, or living at high altitudes where the body compensates for lower oxygen availability by producing more red blood cells. In some cases, elevated hemoglobin can signal a bone marrow disorder called polycythemia vera.

The hemoglobin test requires a simple blood sample, usually drawn from a vein in your arm. No special preparation is typically needed, though your healthcare provider may ask you to fast if other tests are being performed simultaneously. Results are usually available within a few hours to a day. If your hemoglobin levels are abnormal, your doctor may order additional tests to determine the underlying cause and develop an appropriate treatment plan. Regular monitoring of hemoglobin levels is particularly important for people with chronic conditions, pregnant women, and those undergoing certain medical treatments.