Parathyroid hormone regulates calcium and phosphate homeostasis and bone remodelling,4 and determination thereof is crucial in the diagnostic workup of hypocalcaemia, hypercalcaemia, and in the perioperative assessment in thyroid or parathyroid surgery.1,4 Therefore, accurate and reliable PTH assays are needed for proper patient management. The gene discussed is PTH; the disease is Hypocalcemia.