<prompt> The normal value of P50 on the oxyhaemoglobin dissociation curve in an adult is1.8 kPa2.7 kPa3.6 kPa4.5 kPa  <response>: Adult Hb- 50 saturation at PO2 of 26mmHg.1mmHg 0.133 KPa26mmHg 0.133 X 26 3.45 