Serum Iron

Function

Serum iron measures the amount of circulating iron that is bound to transferrin in the blood. Iron is a vital mineral required for the production of hemoglobin, the protein in red blood cells that carries oxygen from the lungs to the rest of the body. It also plays a key role in muscle metabolism and healthy connective tissue.

Why it is Ordered

This test is rarely used in isolation; it is typically part of an Iron Panel (including Ferritin and TIBC). It is ordered to:

• Investigate the cause of anemia (low red blood cell count).
• Evaluate suspected iron deficiency or iron overload (hemochromatosis).
• Monitor the nutritional status of patients with chronic diseases.
• Assess the effectiveness of iron supplementation therapy.

Associated Conditions

• Iron Deficiency Anemia: Characterized by low serum iron, low ferritin, and high TIBC. It can be caused by blood loss, poor diet, or malabsorption (e.g., Celiac disease).
• Hemochromatosis: A genetic condition where the body absorbs too much iron, leading to dangerously high levels that can damage the liver and heart.
• Chronic Disease Anemia: Inflammation can cause the body to sequester iron, leading to low serum levels despite adequate total body stores.
• Lead Poisoning: Can interfere with iron metabolism and hemoglobin synthesis.
• Sideroblastic Anemia: Where the body has iron but cannot incorporate it into hemoglobin.

Understanding serum iron levels is the first step in diagnosing complex blood disorders and ensuring proper oxygenation of tissues.