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. Ans. (c) 1.5gm/dl(Ref: Ganong, 25th ed/p.647)The level of methemoglobin producing cyanosis is 1.5gm/dlIf deoxyhemoglobin (reduced Hb) is 5.0g/dL or greater, cyanosis appears