SOST and Osteopenia: Compared to the normal group, HD patients in the osteopenia or osteoporosis groups were older (p = 0.008); consisted of more females (p = 0.001); of higher values of sclerostin (p < 0.001), alkaline phosphatase (ALP) (p = 0.025), URR (p = 0.006), and Kt/V (p = 0.008); exhibited a lower BMI (p = 0.002).