There is no direct relationship between serum ionization and calcium deficiency. Electrolyte ionization test can only check serum free calcium, whether the body is deficient in calcium is mainly related to the binding of calcium, the serum ionization of calcium is not directly related to whether the body is deficient in calcium, so the serum ionization of calcium is slightly lower than normal, but also can not be sure that the body must be deficient in calcium. Serum ionization is to check the blood sugar and inorganic salt ions in the blood, mainly including blood sugar, blood ions, sodium ions, magnesium ions, free calcium and phosphorus. However, whether the body is deficient in calcium is mainly related to bound calcium, and the level of serum ionized calcium is not directly related to whether the body is deficient in calcium. Bone densitometry can also be performed. If the bone density suggests that the body is in low bone mass or osteoporosis, attention should be paid to calcium supplementation.