Inclusion Criteria:  Adult males or females (≥ 18 years of age) CKD Stage 1 (healthy) CKD Stages 2-4 Subjects willing and able to consent to participating in the study. Subjects whose pre-screen creatinine and eGFR value, if performed, is deemed valuable to the study.  Exclusion Criteria:  Subjects unable to consent to participating in the study. Subjects possessing a cognitive disorder or other condition, which, in the opinion of the investigator, would put the person at risk or seriously compromise the integrity of the study.