Question: what is the difference between primary secondary and tertiary hyperparathyroidism?
Answer: Primary hyperparathyroidism (pHPT): Hypercalcemia results from abnormally active parathyroid glands. Secondary hyperparathyroidism (sHPT): Hypocalcemia results in reactive overproduction of PTH. Tertiary hyperparathyroidism (tHPT): Hypercalcemia results from untreated sHPT, with continuously elevated PTH levels.