hemoglobin Definition

an iron-containing respiratory pigment of vertebrate red blood cells that consists of a globin composed of four subunits each of which is linked to a heme molecule, that functions in oxygen transport to the tissues after conversion to oxygenated form in the gills or lungs, and that assists in carbon dioxide transport back to the gills or lungs after surrender of its oxygen

any of numerous iron-containing respiratory pigments of various organisms (such as invertebrates and yeasts)

the hemoglobin in the red blood cells of the normal human adult

a stable glycoprotein formed when glucose binds to hemoglobin A in the blood; also : a test that measures the level of hemoglobin A1c in the blood as a means of determining the average blood sugar concentrations for the preceding two to three months

an abnormal hemoglobin that occurs in the red blood cells in sickle cell anemia and sickle-cell trait

a hemoglobin variant that predominates in the blood of a newborn and persists in increased proportions in some forms of anemia (such as thalassemia)

hemoglobin a1c

hemoglobin a1c