Observational Study of BIS in Hemodialysis Patients

Inclusion Criteria: 1. Age \>=18 years of age; 2. End-stage renal disease with a GFR \<15 mL/min/1.73m\^2 and dialysis dependent requiring 3-times weekly dialysis; 3. Able and willing to remove shoes and stand on SOZO for BIS measurements; 4. Able to provide written informed consent and authorization to use and disclose health information. Exclusion Criteria: 1. Is enrolled in a concurrent interventional study of an experimental treatment that may confound the results of this study, in the investigator's opinion; 2. Has a clinical condition that would not allow them to complete the study; 3. Is pregnant or planning to become pregnant; women of childbearing potential (or premenopausal) must be on 2 forms of contraception; 4. Is lactating; 5. Has an implanted cardiac rhythm management device (pacemaker or implantable cardioverter defibrillator); 6. Has an amputation of a limb/s resulting in them being unable to make contact with the SOZO electrodes (amputations of fingers and toes are not an exclusion); 7. Patient determined by the attending physician unlikely to be compliant with study procedures.