Hypophosphatemia can be detected by blood phosphorus measurement, urine phosphorus measurement, blood calcium examination, parathyroid hormone measurement, as well as X-ray and other tests. 1. Blood phosphorus measurement: normal adult serum phosphorus is lower than 0.83mmol/L, children’s serum phosphorus is lower than 1.45mmol/L, mostly considered to be due to hypophosphatemia. General serum phosphorus in 0.3 ~ 0.8mmol / L, mostly considered to be mild or moderate hypophosphatemia. If the serum phosphorus is lower than 0.3mmol/L, it is severe hypophosphatemia. 2. Urine phosphorus measurement: Hypophosphatemia patients urine phosphorus test is found to be less than 1.25mmol / L, can be excluded is the renal loss of hypophosphatemia. If the patient has increased urinary phosphorus excretion, it is considered to be caused by rickets, primary renal tubular abnormalities. 3. Blood calcium examination: hypophosphatemia with decreased blood calcium is considered to be caused by vitamin D deficiency, alkalosis, long-term malnutrition and other factors. If hypophosphatemia patients with elevated blood calcium, it is considered to be caused by hyperparathyroidism. 4. Determination of parathyroid hormone: patients with hypophosphatemia will have elevated parathyroid hormone, which is mostly considered to be caused by oncological osteochondrosis, renal tubular lesions. 5. Other: patients with hypophosphatemia also need to do X-ray, nuclear magnetic resonance, urine excretion component test. It is recommended that patients with hypophosphatemia need to consult a doctor in a timely manner, and the doctor will take the appropriate test according to the patient’s condition.