Medicine Minimum concentration of reduced hemoglobin required for cyanosis is: (PGI Nov 2009) A 1gm/dl. B 3 gm/dl C 5 gm/dl D 7 gm/dl 💡 Explanation Minimum concentration of reduced hemoglobin required for cyanosis is: (PGI Nov 2009) ✓ Correct Answer: C. 5 gm/dl