59 patients had PTH values below the normal range and normo- or hypercalcemia, illustrating either hypoparathyroidism under substitution and/or potential cases with artificially suppressed PTH by an inadequately high calcium intake (median calcium value: 2.43 mmol/l, range: 2.20–3.07 mmol/l). The gene discussed is PTH; the disease is hypercalcemia disease.