Iron-Refractory Iron Deficiency Anemia (IRIDA)

Iron-Refractory Iron Deficiency Anemia, or IRIDA, is a rare genetic blood disorder. People with this condition have low iron levels in their blood. Their bodies also have trouble using iron properly, even when iron stores are normal or high.

IRIDA is caused by mutations in a gene called TMPRSS6. This mutation leads to too much hepcidin, a hormone that controls iron absorption. When hepcidin levels are too high, your body blocks iron from entering your bloodstream. This creates a unique problem where oral iron supplements don't work well.

Unlike typical iron deficiency anemia, IRIDA does not respond to oral iron pills. Even high doses of oral iron fail to raise blood iron levels. People with IRIDA usually need intravenous iron treatments, which deliver iron directly into the bloodstream. This bypasses the absorption problem and provides partial relief from symptoms.

• Fatigue and persistent tiredness that doesn't improve with rest
• Pale skin, nail beds, and inner eyelids
• Shortness of breath during normal activities or exercise
• Dizziness or lightheadedness, especially when standing up
• Cold hands and feet due to poor circulation
• Rapid or irregular heartbeat
• Brittle nails that break easily
• Frequent headaches
• Difficulty concentrating or brain fog
• Weakness in muscles

Symptoms usually begin in childhood or early adulthood. Some people have mild symptoms that develop slowly over time. Others may not realize they have IRIDA until blood tests reveal low iron levels that don't respond to treatment.

IRIDA is caused by inherited mutations in the TMPRSS6 gene. This gene provides instructions for making a protein that regulates hepcidin production. When the gene is mutated, your body produces too much hepcidin. High hepcidin levels block iron absorption in the intestines and prevent stored iron from being released into the bloodstream.

This condition follows an autosomal recessive pattern. This means you must inherit two copies of the mutated gene, one from each parent. Parents who carry one copy typically have normal iron levels and no symptoms. Family history is the primary risk factor. If both parents carry the mutation, each child has a 25% chance of developing IRIDA. The condition affects males and females equally and appears across all ethnic groups.

Diagnosing IRIDA starts with blood tests that measure iron levels. A serum iron test or total iron test shows how much iron is circulating in your blood. People with IRIDA have low serum iron despite normal or high ferritin levels. Ferritin measures stored iron in the body. This unusual pattern helps distinguish IRIDA from typical iron deficiency anemia.

Your doctor will also check your response to oral iron supplements. If your iron levels don't improve after several weeks of oral iron therapy, IRIDA may be suspected. Genetic testing can confirm the diagnosis by identifying mutations in the TMPRSS6 gene. Rite Aid offers serum iron testing at Quest Diagnostics locations nationwide. Regular monitoring helps track your iron levels and guide treatment decisions.

• Intravenous iron infusions to deliver iron directly into the bloodstream
• Regular blood tests to monitor serum iron and hemoglobin levels
• Eat iron-rich foods like red meat, poultry, fish, and leafy greens
• Pair iron-rich foods with vitamin C sources to enhance absorption
• Avoid taking calcium supplements or antacids with meals, as they can interfere with iron
• Limit tea and coffee during meals, which reduce iron absorption
• Work with a hematologist who specializes in blood disorders
• Genetic counseling for family planning decisions

Oral iron supplements typically do not work for IRIDA. Treatment focuses on intravenous iron therapy given every few months. Your doctor will determine the right schedule based on your blood test results and symptoms. Maintaining adequate iron levels helps reduce fatigue and prevents complications like heart problems.