PTH and hyperparathyroidism: Of the 67 patients studied, 45 (67.1%) cases of hypercalcemia were classified as related to persistent post-transplant hyperparathyroidism (group A) and 16 patients (23.8%) were classified as transient post-transplant hypercalcemia (group B) with decreased calcemia and PTH to almost normal levels around the first year after KTx.