TOPICS: Calcium levels, bone, kidney, small intestine, vitamin D3, parathyroid hormone (PTH), calcitonin, chief cells, parathyroid glands, calcium-sensing receptors (CaSR), osteoblast, osteoclast, RANK receptors, bone, kidneys, gut, 1alpha-hydroxylase, 25-hydroxyvitamin D3, 24,25-hydroxyvitamin D, 25-hydroxycholecalciferol, 25-hydroxylase, calcitriol, active vitamin D, hypoparathyroidism, DiGeorge syndrome, multiple endocrine neoplasia type 1 (MEN 1), familial hypoparathyroidism, hyperparathyroidism, primary hyperparathyroidism, hypercalcemia, osteopenia, osteoporosis, secondary hyperparathyroidism, 7-dehydrocholesterol, cholecalciferol, vitamin D3, liver failure, kidney failure, calcium, phosphate, hypocalcemia, hypophosphatemia, hyperphosphatemia, granulomatous diseases, sarcoidosis, tuberculosis, macrophages, lymphoma, thyroid, C cells, medullary carcinoma of the thyroid, fine-needle aspiration (FNA)
