The normal reference range of blood gas analysis LaC is 0.5-1.7mmol/L. Blood gas analysis LaC refers to the indicator of lactic acid in arterial blood, which is mainly used to measure the concentration of hydrogen ions and dissolved gases in human blood, and is used to reflect the respiratory function of the human body, as well as the state of acid-base balance of body fluids. Blood gas analysis LaC examination for hypoxemia, cardiac insufficiency and other diseases monitoring, as well as the evaluation of the treatment effect is of great significance.LaC is the body’s sugar substances in the main metabolism of one of the substances, if the body has symptoms of hypoxia, the body due to the occurrence of anaerobic metabolic reaction, that is, the anaerobic glycolysis, caused by the lactic acid content of the symptoms of the elevation of the severity of hypoxia and the content of the LaC present a positive relationship between. The severity of hypoxia is positively related to the level of LaC. When the LaC of blood gas analysis is greater than 4.0mmol/L, it is necessary to take appropriate emergency measures in time, and the LaC is greater than 9.0mmol/L, which indicates that there is a severe hypoxia, suggesting that the prognosis is extremely poor, and may be life-threatening at any time.