Side effects of excess vitamin D or calcium most immediately include hypercalcemia and hypercalciuria ... When serum calcium falls, parathyroid hormone (PTH) secretion increases.

The parathyroid hormone (PTH) plays a fundamental role in regulating ... than normal or close to the lower limit of the reference range in most patients with hypercalcemia of nonparathyroid origin, ...

TSH (Thyroid-Stimulating Hormone) Test. Endocrine Society. Thyroid and Parathyroid Hormones. National Cancer Institute. Thyroxine. Romieu I, Dossus L, Barquera S, Blottière HM, Franks PW, Gunter M, ...