eGFRcr-cys is more precise than eGFRcr.1 The KDIGO CKD clinical practice guideline suggests determining eGFRcr-cys for patients with eGFRcr of 45 to 59mL/min/1.73m2 without markers of kidney damage, such as albuminuria. In the United States, 3.6% of adults overall and 31% of those classified as having CKD based on eGFRcr and urine albumin-creatinine ratio (UACR) have eGFRcr of 45 to 59mL/min/1.73m2 and UACR