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Definition of Deoxyhemoglobin
Medically reviewed by Min Clinic Staff | Updated: January 2026
Deoxyhemoglobin: The form of hemoglobin without oxygen, the predominant protein in red blood cells.
Hemoglobin forms an unstable, reversible bond with oxygen. In its oxygen-loaded form it is oxyhemoglobin and is bright red. In the oxygen-unloaded form it is called deoxyhemoglobin and is purple-blue.