Keywords: پیتت; Bone markers; Bone turnover; Review; Bone derived hormones; Clinical utility; Metabolic bone disease; Paget; Osteoporosis; Tumor induced osteomalacia; van Buchem disease; Hypophosphatemic disease; Osteoblast; Osteoclast; Osteocyte; FGF23; PINP; CTX-I; BAL