<unk>  is a rare condition in which there is excess sulfhemoglobin (SulfHb) in the blood. The pigment is a greenish derivative of hemoglobin which cannot be converted back to normal, functional hemoglobin. It causes cyanosis even at low blood levels. It is a rare blood condition in which the β-pyrrole ring of the hemoglobin molecule has the ability to bind irreversibly to any substance containing a sulfur atom. When hydrogen sulfide (H2S) (or sulfide ions) and ferrous ions combine in the heme of hemoglobin, the blood is thus incapable of carrying oxygen.
Sulfhemoglobinemia
Methemoglobinemia
Organic acidemia
Cyanide poisoning
Hyperaemia
Isovaleric acidemia
Propionic acidemia
Algaemia