The clinical significance of blood PH value is to determine the degree of compensation of the body in acid-base imbalance, PH value less than 7.35 is decompensated acidosis, PH value more than 7.45 is decompensated alkalosis. Blood PH value is usually measured by doing arterial blood gas analysis. PH value is an indicator of the concentration of hydrogen ions or acidity of body fluids, depending on the bicarbonate buffer pair in blood, where bicarbonate is regulated by kidney and carbonic acid is regulated by lung, and when the ratio of both is 20:1, blood PH value is 7.40.