Cerebrospinal fluid glucose to serum glucose ratio

Glucose in normal cerebrospinal fluid has a constant ratio to glucose in the blood. It was thought that the blood-brain barrier could permeate glucose; it was later realized that this permeation is not simply a diffusion, but a membrane operation, called a carrying operation or Carrying dispersion, the glucose content in the cerebrospinal fluid depends on the following factors: ① the concentration of blood glucose; ② the permeability of the blood-brain barrier; ③ the degree of glucose hydrolysis in the cerebrospinal fluid; Determination of serum glucose is one of the most important tests for diagnosing diabetes. Diabetic patients have varying degrees of elevated serum glucose.