FGF23 and left ventricular hypertrophy: Serum phosphate (iP), calcium, and intact parathyroid hormone (iPTH) are proposed to regulate FGF23 levels in uremic patients on maintenance hemodialysis [6], and current data suggest higher circulating levels of FGF23 are associated with mortality [7–11], especially cardiovascular mortality [10, 12–15] due to vascular calcification [16–19] or left ventricular hypertrophy (LVH) [20–23].