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Hemoglobin E (HbE) is an abnormal hemoglobin with a single point mutation in the β chain. At position 26 there is a change in the amino acid, from glutamic acid to lysine (E26K). Hemoglobin E is very common among people of Southeast Asian, Northeast Indian, Sri Lankan and Bangladeshi descent. [1] [2]
Alpha thalassemia is caused by deficient production of the alpha globin component of hemoglobin, while beta thalassemia is a deficiency in the beta globin component. [7] The severity of alpha and beta thalassemia depends on how many of the four genes for alpha globin or two genes for beta globin are faulty. [ 2 ]
This geographical distribution is thought to be due to the beta-thalassemia carrier state (beta-thalassemia minor) conferring resistance to malaria. [20] In 2005, it was estimated that 1.5% of the world's population are carriers and 60,000 affected infants are born with the thalassemia major annually.
Conversely, in thalassemia, which is a disorder of globin synthesis, the number of RBCs produced is normal, but the cells are smaller and more fragile. Therefore, the RBC count is normal, but the MCV is low, so the index will be less than 13. [5]
Hemoglobin S/ beta thalassemia: common in African and Mediterranean populations, it is clinically similar to sickle-cell anemia. [35] Delta-beta thalassemia is a rare form of thalassemia in which there is a reduced production of both the delta and beta globins. It is generally asymptomatic. [36] There are two clinically significant combinations ...
Reference ranges (reference intervals) for blood tests are sets of values used by a health professional to interpret a set of medical test results from blood samples. Reference ranges for blood tests are studied within the field of clinical chemistry (also known as "clinical biochemistry", "chemical pathology" or "pure blood chemistry"), the ...
Beta-thalassemia: D56.1: 3087: Beta-thalassemia (β-thalassemia) is an autosomal dominant blood condition that results in the reduction of hemoglobin production. The cause for the disorder is related to a genetic mutation of the HBB gene. This gene is responsible for providing the instructions to produce beta-globin; one of the major components ...
The physiological effects of these variants can range from minor to severe. [3] Mutations can caused impaired production of hemoglobin (thalassemia) or produce structurally altered hemoglobins. Some hemoglobin variants, such as HbS which causes sickle-cell anemia, are responsible for severe diseases and are considered hemoglobinopathies.
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