Blood Test Identifies Alzheimer's Risk in Healthy Individuals

Hemoglobin is a protein found in red blood cells that plays a crucial role in transporting oxygen from the lungs to all tissues and organs throughout the body. It also helps carry 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 common laboratory tests performed as part of a complete blood count. This test helps healthcare providers evaluate your overall health and diagnose various medical conditions, particularly those affecting red blood cells.

The hemoglobin test is used to screen for, diagnose, and monitor several health conditions. It is commonly ordered to detect anemia, a condition where you have too few red blood cells or insufficient hemoglobin, which can cause fatigue, weakness, and shortness of breath. The test also helps identify polycythemia, a condition where you have too many red blood cells. Healthcare providers may order this test as part of routine health screenings, before surgery, during pregnancy, or when you have symptoms such as persistent tiredness, pale skin, dizziness, or unusual bleeding. It is also used to monitor chronic conditions affecting red blood cells and to evaluate the effectiveness of treatments for blood disorders.

Normal hemoglobin levels vary depending on age and sex. For adult men, normal values typically range from 13.5 to 17.5 grams per deciliter, while for adult women, the range is usually 12.0 to 15.5 grams per deciliter. Children and infants have different reference ranges that change as they grow. Low hemoglobin levels may indicate anemia caused by iron deficiency, vitamin deficiencies, blood loss, chronic diseases, or bone marrow problems. High hemoglobin levels can result from living at high altitudes, dehydration, smoking, lung disease, or certain blood disorders.

The hemoglobin test requires a blood sample, which is usually collected from a vein in your arm. No special preparation is typically needed, though your healthcare provider will inform you if fasting or other preparations are necessary. The blood draw takes only a few minutes, and results are usually available within a day. If your hemoglobin levels are abnormal, your healthcare provider may order additional tests to determine the underlying cause and recommend appropriate treatment based on your specific situation.