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Hemoglobin ( haemoglobin, [ a] Hb or Hgb) is a protein containing iron that facilitates the transport of oxygen in red blood cells. Almost all vertebrates contain hemoglobin, [ 3] with the exception of the fish family Channichthyidae. [ 4]
Hemoglobin A (HbA), also known as adult hemoglobin, hemoglobin A1 or α 2 β 2, is the most common human hemoglobin tetramer, accounting for over 97% of the total red blood cell hemoglobin. [1] Hemoglobin is an oxygen-binding protein, found in erythrocytes , which transports oxygen from the lungs to the tissues. [ 2 ]
Hemoglobinemia (or haemoglobinaemia) is a medical condition in which there is an excess of hemoglobin in the blood plasma. This is an effect of intravascular hemolysis, in which hemoglobin separates from red blood cells, a form of anemia . Hemoglobinemia can be caused by intrinsic or extrinsic factors. When hemoglobinemia is internally caused ...
Hemoglobin F is the primary hemoglobin produced by the fetus. The hemoglobin transports oxygen efficiently in a low oxygen environment. The hemoglobin production stops at birth and decreases to adult levels by the age of one or two. The levels can be normal to increased in beta thalassemia.
Hemoglobin C (abbreviated as HbC) is an abnormal hemoglobin in which glutamic acid residue at the 6th position of the β-globin chain is replaced with a lysine residue due to a point mutation in the HBB gene. [1] People with one copy of the gene for hemoglobin C do not experience symptoms, but can pass the abnormal gene on to their children.
Hemoglobin H disease is a genetic disorder resulting in absent or impaired production of the α-globin protein, a normal component of the hemoglobin. The disease occurs when the α-globin gene expression is reduced to less than 30% of the normal expression. [ 2] In a healthy individual there are four copies of the gene which encode the alpha ...
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