The study explores the importance of intact parathormone testing in assessing parathyroid gland function in various conditions. It looks at primary and secondary hyperparathyroidism, hypoparathyroidism, and hyperthyroidism. The researchers reviewed how intact parathormone testing fits into diagnosing calcium balance issues by examining calcium levels, bone metabolism markers, and other hormones involved in calcium regulation. They also studied the relationship between intact parathormone levels and other parathormone fragments.