PTH and bone disorder: <h4>Objective</h4>This study aims to evaluate the correlation between parathyroid hormone measured by a second-generation assay (PTHG2) and by a third-generation assay (PTHG3), and their association with mineral and bone disorder (MBD) biochemical parameters and radiographic vascular calcification score in kidney transplant recipients (KTRs).<h4>Materials and methods</h4>We evaluated 87 KTRs and measured PTHG2, PTHG3, biochemical profile, urinary fractional excretion of calcium (FE Ca) and phosphate, 25(OH)D3, and Kauppila score for vascular calcification.