<prompt> In a patient pO2 is 85 mmHg, pCO2 is 50 mmHg, pH is 7.2, and HCO3- is 36mmolL. The condition isRespiratory acidosis with compensatory metabolic alkalosisUncompensated respiratory acidosisRespiratory alkalosis with compensatory metabolic acidosisRespiratory acidosis with compensatory metabolic acidosis  <response>: pH is decreased 7.35 so it is acidosis. The CO2 levels are increased 45 mmHg, which is in line with the change in pH in acidosis CO2 is expected to raise, thus the primary problem is respiratory. The HCO3- levels are increased 30mmolL, which is opposite to change in pH i.e., there is acidosis and HCO3- levels are high, thus , there is compensatory metabolic alkalosis. Thus this is a case of respiratory acidosis with compensatory metabolic alkalosis. Ref: Oxford handbook of medicine 5th edition Pgno: 684 