<prompt> Aerial blood gas analysis of a patient admitted to the medical emergency is as follows: pH7.2, HCO338 mmolL, Pco2 56 mm Hg. This indicatesMetabolic acidosisMetabolic acidosis with respiratory compensationRespiratory acidosisRespiratory acidosis with renal compensation  <response>: Acid-Base DisorderspH 7.35 is acidosis; pH 7.45 is alkalosis1deg change in HCO3 is termed as Metabolic Normal HCO3 22-30 meqlIf change in HC03 is in keeping with the pH i.e. if there is acidosis and HC03 is decreased the problem is metabolic one.If change in HC03 is opposite with the pH i.e. if there is acidosis and HC03 is increased or normal the problem is compensatory metabolic.1deg change in C02 is termed as Respiratory Normal C02 35-45 meq1If change in C02 is in keeping with the pH i.e. if there is acidosis and C02 is increased the problem is respiratory.If change in C02 is in opposition with the pH i.e. if there is acidosis and C02 is decreased or normal the problem is termed as compensatory respiratory.Refer: Harrisons Principles of Internal Medicine, 18th edition, pg no: 363-372 