CO2CP is measured as a volume fraction, with a normal reference range of 50%-70%, and as a concentration, with a normal reference range of 23-31 mmol/L. CO2CP is known as carbon dioxide binding capacity, which is one of the main clinical indicators of the acid-base balance of body fluids. If the actual value of CO2CP is lower than the normal standard range, it is more likely that the body’s carbon dioxide binding capacity has decreased and the body is suffering from metabolic acidosis or respiratory alkalosis, such as diabetic ketoacidosis, renal failure, renal tubular acidosis, etc. If the actual value of CO2CP is lower than the normal standard range, it is more likely that the body’s carbon dioxide excretion function is impaired and the body is suffering from respiratory acidosis or metabolic alkalosis, such as emphysema, pneumoconiosis, pulmonary heart disease, etc. Pulmonary heart disease, etc.