Will vary depending on response to the antidote and persistence of symptoms. Discuss with toxicologist/poison control
Methemoglobinemia
Consider rare entity of sulfhemoglobinemia
Sulfhemoglobinemia
Sulfonamides, sulfasalazine, phenazopyridine
Dyshemoglobinemia
Occupational exposure
Hypoxemia
Conventional co-oximerty misidentifies sulfhemoglobin as methemoglobin so diagnosis is suspected when patient does not respond to methylene blue