The concentration of methemoglobin to cause cyanosis-: (A) 5 gm/dl, (B) 2 gm/dl, (C) 1.5 gm/dl, (D) 12 gm/dl
Answer is C. For Cyanosis to occur,
Sulfhemoglobin should be equal or more than 0.5gm/dL
Methemoglobin should be equal or more than 1.5gm/dL
Deoxygenated hemoglobin should be equal or more than 5gm/dL