dyshemoglobin

(redirected from dysHb)

dyshemoglobin

(dĭs-hĕm″ō-glō′bĭn),

dysHb

A hemoglobin derivative that is incapable of reversibly associating with oxygen, and so is unable to carry oxygen from the lungs to the cells. The primary defect in dyshemoglobins is a chemical (or stereochemical) alteration of the heme prosthetic group. Two common dyshemoglobins are carboxyhemoglobin (COHb) in which carbon monoxide is covalently bonded to the hemoglobin molecule, and methemoglobin (metHb) in which the ferrous iron is oxidized to the ferric form. Other, indeterminate dyshemoglobins exist in minute amounts in circulating blood.
References in periodicals archive ?
2] may be oximetry are discrepant, inaccurate in an abnormal Hb may be hospitalized patients present and if dysHb (a) present Pulse oximeter Inaccurate when interfering When MetHb is >25%, the substances are present: pulse oximeter will read MetHb, COHb, SHb, saturation of 75-85% dyes CO-oximeter Invasive, performed in Most accurate method; even laboratory; not all in cases of CO poisoning instruments report SHb and methemoglobinemia.