Definition of carboxyhemoglobin in US English:



  • A compound formed in the blood by the binding of carbon monoxide to hemoglobin. It is stable and therefore cannot absorb or transport oxygen.

    • ‘What happens is the CO combines with the haemoglobin in the blood to form the relatively stable carboxyhaemoglobin and renders the blood ineffectual as an oxygen carrier.’
    • ‘If someone has the symptoms of CO poisoning, a blood sample will be taken to check the amount of carboxyhaemoglobin in the blood.’
    • ‘Pulse oximetry cannot differentiate between oxyhaemoglobin and carboxyhaemoglobin, and may therefore give normal results.’
    • ‘When haemoglobin mixes with carbon monoxide it produces a compound called carboxyhaemoglobin.’
    • ‘The presence of carboxyhaemoglobin also diminishes the oxygen held by the normal haemoglobin, which further compounds the hypoxic effect.’