Color chart for the detection of the amount of<unk> moglobin in the blood Arterial blood with elevated<unk> moglobin levels has a characteristic chocolate-brown color as compared to normal bright red oxygen-containing arterial blood. If<unk>  is suspected, an arterial blood gas and CO-oximetry panel should be obtained. Differential diagnosis Other conditions that can cause bluish skin include argyria, sulfhemoglobinemia, and heart failure.
Methemoglobinemia
Argyria
Sulfhemoglobinemia
Heart failure
Hyperaemia
Hypoxemia
Organic acidemia
Hypercapnia