All of the following factors influence hemoglobin dissociation curve, except: (A) Chloride ion concentration, (B) CO2 tension, (C) Temperature, (D) 2–3 DPG levels
Answer is A. Hb-O2 dissociation curve shift to left indicates more affinity of Hb to O2 and thus less delivery of O2 to tissues.
Shift to left seen in
-        Increased pH
-        Decreased 2,3 DPG, temperature, PCO2
-        HbF (Fetal)
Shift to right seen in
-        Decreased pH
-        Increased 2,3DPG, temperature, PCO2
-        HbS (Sickle cell)