PTH and sarcopenia: A linear association between elevated serum levels of intact PTH and low appendicular skeletal muscle index was found in a cohort of peritoneal dialysis patients, with individuals with intact PTH levels above 300 pg/mL displaying a 4.74-fold increased odds ratio (OR) (95% CI: 1.53–14.70) for sarcopenia compared with those having intact PTH levels less than 150 pg/mL [36].