Which disorder is characterized by slightly bluish/dark-purple skin discoloration, most easily seen in the nail beds and mucous membranes, due to an increased quantity of methemoglobin, hemoglobin not combined with oxygen in systemic blood.

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Cyanosis is characterized by a bluish or dark-purple skin discoloration due to the presence of deoxygenated hemoglobin in blood vessels near the skin surface, often visible in the nail beds and mucous membranes. It can occur when there is an increased quantity of methemoglobin, a form of hemoglobin that is unable to bind oxygen.

Which Disorder Is Characterized by Slightly Bluish/dark-Purple Skin Discoloration, Most