Rickets is caused by a deficiency of vitamin D, which leads to abnormal calcium and phosphorus metabolism, and thus abnormal bone development. Generally, rickets requires biochemical blood tests and vitamin D level assessments, followed by skeletal X-ray examinations. However, some cases of rickets are caused by other special reasons, such as abnormalities in liver and kidney functions, and there may also be congenital genetic diseases. Therefore, rickets also requires further related examinations, such as liver function tests, kidney function tests, and parathyroid hormone tests, and even some genetic level examinations might be conducted.