Normal adjusted calcium and high PTH. Confirmed on at least 2 occasions, 8 patients had normal ionized Ca, 25(OH) D > 20 ng/mL. Excluded FHH, liver disease, renal disease, urinary calcium > 87.5mmol/24h, GI disease with malabsorption, metabolic bone disease, medications (lithium, thiazide, oestrogens, loop diuretics, bisphosphonates, anticonvulsants). This evidence concerns the gene PTH and kidney disorder.