PTH and cranioectodermal dysplasia: Interestingly, an Italian study collecting data from 105 CeD patients for lab tests found that untreated CeD subjects had 22.0% lower serum 25(OH)D3 (p = 0.023), 42.5% higher serum PTH (p < 0.001) but without alterations in serum calcium and phosphorus, and 13.0% higher serum 1,25(OH)2D3 (p = 0.029) compared to subjects on a GFD [234].