In this study, the investigators will follow up people with CKD in two visits a year apart. In both visits, the investigators will measure the participants body composition and estimated kidney function using 2 different testing methods - Cystatin C eGFR and Creatinine eGFR. Using both the results in a formula, the creatinine muscle index can be calculated. If this index correlated with sarcopenia, it will be helpful tool in the care of people with CKD as will be a easy to use screening tool for sarcopenia in this population.
