The other biochemical parameters observed in most patients with XLH and their reported prevalence rates are normal serum calcium levels (89.2%–100%),(37, 41, 42, 60) normal serum vitamin D levels (81.3%–100%),(38, 41) normal or mildly increased serum parathyroid hormone (PTH) levels (54.4%–100%),(33, 41, 42) and inappropriately normal or elevated intact fibroblast growth factor‐23 (iFGF‐23) levels (74.2%–100%).(32, 33, 36, 37) iFGF‐23 testing is not widely available, and results should be interpreted with caution because of lack of standardization and potential influence by treatment.(4, 11). Here, PTH is linked to X-linked dominant hypophosphatemic rickets.