Blood ion is mainly to check blood glucose and inorganic salt ions in the blood, including blood glucose, blood ion, sodium ion, magnesium ion, blood calcium and blood phosphorus. Under normal health conditions, blood glucose and blood ions are stable in the body and remain in a certain balance range to maintain the normal metabolism and osmotic pressure of the body. When the body suffers from certain diseases, it affects blood glucose and serum ions, and disorders of glucose metabolism and electrolyte imbalance occur. For example, when a patient has diabetes, glucose metabolism is disturbed and blood glucose will be elevated. Insufficient carbohydrate intake during starvation will result in hypoglycemic symptoms. Some serious underlying diseases, such as acute and chronic renal failure, when severe dehydration, there will be elevated serum magnesium and blood potassium. Excessive vitamin D intake can lead to elevated blood calcium and inorganic phosphorus, and long-term calcium deficiency can lead to osteoporosis. In acute gastroenteritis, patients can have lowered serum ions due to both vomiting and diarrhea. Therefore, serum ions are closely related to human health. If the body is deficient in one ion, it can lead to an imbalance of electrolytes in the blood, affecting health or leading to aggravation of pre-existing diseases, which can be life-threatening in serious cases.