Cut off limit for deoxygenated hemoglobin for appearance of cyanosis is?: (A) >4 gm%, (B) >5 gm%, (C) < 2 gm%, (D) <4 gm%
Answer is B. Ans. B >5gm%Ref: Ganong, 25th ed. pg. 642Cyanosis appears whenever the magnitude of reduced hemoglobin level of blood in capillaries is >5 gm%.