Endocrine Abstracts

Parathyroid hormone (PTH) has a biphasic effect on bone cells and can induce opposing responses resulting in both net bone loss and net bone formation. Patients with primary hyperparathyroidism (PHPT) lose the circadian rhythm for PTH and bone mass decreases. PTH administered intermittently resulting in increase in bone mass. We studied the differences in the circadian variability of bone turnover markers between women with PHPT and women with postmenopausal osteoporosis treat...