Oral calcium load tests confirmed the absence of resorptive and absorptive hypercalciuria, with adequate PTH inhibition during the test; of note, “baseline” PTH levels tended to be at the upper normal limit (83(65–131) ng/L, local upper normal limit 65ng/L) that was not adequate in view of hypophosphatemia, with 25D levels at 44(19–92) nmol/L. This evidence concerns the gene PTH and Hypercalciuria.