Meanwhile, the patient's lumbar spine T-score (-2.0%) and YAM value (73%) upon admission did not meet the diagnostic criteria for osteoporosis, indicating the presence of osteopenia. Although the serum calcium level upon admission was within the normal range, serum phosphorus and PTH levels were not measured, and the possibility of hyperparathyroidism, which might be related to osteopenia, cannot be completely ruled out. The gene discussed is PTH; the disease is Osteopenia.