The difference between iron deficiency anemia and thalassemia

Written by Li Fang Fang

Hematology

Updated on September 03, 2024

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Iron deficiency anemia and thalassemia have similarities in that both are classified as microcytic hypochromic anemia. However, iron deficiency anemia and thalassemia are two distinct diseases that require further differential diagnosis.

Iron deficiency anemia is caused by iron deficiency, often due to chronic blood loss, and it can be cured if the cause is removed and iron supplementation treatment is provided. Thalassemia is a genetic disease with hereditary factors, and there is no particularly effective treatment; iron supplementation is ineffective. Treatment mainly involves red blood cell transfusions and is not curable.

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What effect does thalassemia in pregnant women have on the fetus?

Thalassemia is a common hereditary hemolytic disease caused by genetic defects regulating globin synthesis, leading to reduced or absent globin production. This results in shortened red blood cell lifespan and subsequently chronic hemolytic microcytic hypochromic anemia. Thalassemia is classified into α-thalassemia and β-thalassemia. α-thalassemia is more common and includes silent carrier state, trait, HBH disease, and Hb Bart's hydrops fetalis. The silent carrier state shows no clinical symptoms with a 2% chance of hydrops fetalis in newborns. The trait generally causes mild anemia with a 3%-5% chance of hydrops fetalis in newborns. HBH disease often presents with moderate to severe permissive anemia, typically accompanied by hepatosplenomegaly, depressed nasal bridge, and widened eye distance, giving a distinct anemic appearance. β-thalassemia is categorized into mild, severe, and intermediate β-thalassemia. Mild β-thalassemia does not show visible physical changes, mainly presenting as mild anemia. Severe β-thalassemia can exhibit extramedullary hematopoiesis causing distinctive facial features, delayed sexual development, and poor growth. The severity of intermediate β-thalassemia varies; some patients require regular blood transfusions to sustain life, allowing survival into adulthood.

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Hematology

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What tests are for thalassemia?

Thalassemia firstly requires genetic diagnosis through a series of techniques such as DNA restriction endonuclease map PCR, which identify the genotype of thalassemia. Secondly, hemoglobin electrophoresis needs to be completed. Through complete hemoglobin electrophoresis, it can discriminate between silent gene carriers and those with thalassemia, hemoglobin H disease, and hemoglobin Bart's hydrops fetalis syndrome. Additionally, a significant increase in hemoglobin A2 in overt thalassemia also has certain specificity. Thirdly, a complete bone marrow picture is necessary, which will match the bone marrow picture of hemolytic anemia. There is pronounced erythroid hyperplasia, positive iron staining, and an increase in sideroblastic erythroblasts. Fourthly, a complete blood count is needed. Different types of blood counts show different levels of hemoglobin reduction. In mild thalassemia and thalassemia traits, hemoglobin is mostly normal or mildly decreased. In severe thalassemia, hemoglobin is generally below 50 grams per liter, indicating a severe anemic state. Blood smears might show anisocytosis, poikilocytosis, and target cells. It is common to see nucleated erythrocytes and reticulocytes significantly increased, which matches the signs of hemolytic anemia. Fifth, iron metabolism testing needs to be completed. By improving iron metabolism testing, it serves as a discriminant for silent gene carriers, as well as those with thalassemia traits and patients with mild thalassemia based on serum iron, iron saturation, and serum ferritin concentration. Sixth, X-ray examination needs to be completed. Severe thalassemia features typical hair-on-end changes, visible as vertical striations between the trabeculae of the cortical bone in the skull X-rays, resembling upright hair and rays of sunlight.

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How to test for thalassemia?

Thalassemia is a genetic disease, a hereditary condition, caused by abnormal production of globin in hemoglobin, leading to hemolytic anemia. Patients with thalassemia should first undergo a routine blood test. If the routine blood test indicates anemia or even if there is no anemia but the red blood cells are very small, it suggests a high possibility of thalassemia. At this point, further screening for thalassemia genes should be conducted to confirm the diagnosis. Once thalassemia is definitively diagnosed, it can be classified as mild, moderate, or severe based on the genotype.

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Is Mediterranean anemia leukemia?

Thalassemia, formerly known as Mediterranean anemia or oceanic anemia, is a hereditary hemolytic anemia caused by mutations or deletions in globin genes, leading to insufficient synthesis of globin peptide chains. Those who lack beta chains are referred to as having beta-thalassemia, and those who lack alpha chains are known as having alpha-thalassemia. Clinically, it is classified into mild, intermediate, and severe forms based on the severity of anemia. The disease is widespread in many regions of the world, including the Mediterranean, the Middle East, Africa, Southeast Asia, and southern China. In China, it is more commonly found in Guangxi, Guangdong, Sichuan, Hong Kong, northern Taiwan, Yunnan, Guizhou, Hainan, Fujian, Hunan, and Hubei, and less commonly in the north. Thalassemia is fundamentally defined not as leukemia, but as a genetic disease.

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Do you still need to get tested for Mediterranean pregnancy after pre-pregnancy testing?

After checking for thalassemia before pregnancy, it is still necessary to check again after becoming pregnant. The purpose of the thalassemia test is to examine some genes to see if there are any genetic issues. Additionally, the husband also needs to be cautious to see if there is a possibility of hemolysis occurring. The thalassemia screening test is aimed at those who have severe hemolysis, or have previously given birth to a child with thalassemia, or if one of the spouses is a carrier of thalassemia trait, then a re-examination is necessary.