Physiology 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 💡 Explanation The normal value of P50 on the oxyhaemoglobin dissociation curve in an adult is: ✓ Correct Answer: C. 3.6 kPa