The normal value of P50 on the oxyhaemoglobin dissociation curve in an adult is: (A) 1.8 kPa, (B) 2.7 kPa, (C) 3.6 kPa, (D) 4.5 kPa
Answer is C. Adult Hb- 50% saturation at PO2 of 26mmHg.
1mmHg= 0.133 KPa
26mmHg= 0.133 X 26 = 3.45