In our small, single tertiary center cohort of pediatric patients with disorders of calcium metabolism, the most common condition was hypoparathyroidism (n = 7), followed by PTH resistance (n = 3), hyperparathyroidism (n = 1), calcipenic rickets (n = 1), and syndromic hypercalcemia (n = 1). This evidence concerns the gene PTH and hypoparathyroidism.