The normal range of calcium is between 2.25-2.75 mmol/L. Calcium ions in the body are stored in plasma, and the concentration of calcium ions can be measured by drawing blood. Calcium ion concentration is influenced by the body’s acid-base balance, and there are many dangers to the body when the concentration is too high or too low. A decrease in calcium ion concentration can cause muscles to become excited, leading to convulsions and seizures, and can increase the concentration of phosphorus ions, which can be deposited in joints and blood vessels to form calcifications, while an increase in calcium ion concentration can destroy bone activity and form fractures. It also affects kidney function, causing gradual kidney failure and reduced filtration rate, and many substances will leak out of the original urine. Excessive calcium ions will affect heart function and life-threatening atrial fibrillation and ventricular fibrillation will occur. If the calcium ion concentration is not within the normal range, it is important to take relative measures to control the disease in time to avoid gradual aggravation of the disease.