In a study of 77 PHPT patients with a single adenoma, Yamashita et al. reported that the half-lives of iPTH, (1-84)PTH, and (7-84)PTH were 2.92 ± 0.13, 2.33 ± 0.09, and 9.89 ± 3.30 minutes, respectively [59]. Here, PTH is linked to adenoma.