PTH and hyperparathyroidism: In a longitudinal study of 14 adolescent KTx recipients, Terpstra et al. (2012) reported a significantly lower trabecular vBMD Z-scores 12 months after KTx in association with greater glucocorticoid exposure; in addition, the authors report cortical bone loss at transplantation associated with hyperparathyroidism severity and a significant increase of cortical vBMD Z-scores 12 months after KTx, associated with lower glucocorticoid exposure and lower PTH levels [19].