Normal values for serum 25 hydroxyvitamin D are above 75 nmol/L. 25 Hydroxyvitamin D is the main form of vitamin D in the human body, and its normal range is above 75nmol/L, below which it is considered abnormal, and long-term large-scale deficiencies can cause disease. Clinically, 25 hydroxyvitamin D deficiency can cause rickets in children and osteomalacia in adults. When vitamin D deficiency occurs, it is necessary to identify the cause of the disease and treat it in a timely manner, and it can be supplemented by oral vitamin D. However, the specific treatment plan must be combined with the specific situation of the patient, and it is necessary to leave it to the doctor for symptomatic treatment. If deficiency occurs, please consult a doctor promptly.