Standardization of Serum Creatinine and Estimated GFR in the Kidney Early Evaluation Program (KEEP)

Bland-Altman plot for comparison of Satellite Laboratory Services versus Cleveland Clinic Research Laboratory (CCRL) after exclusion of outliers. Dashed lines, 1 SD. To convert serum creatinine in mg/dL to μmol/L, multiply by 88.4.

Bland-Altman plot for comparison of Clinical Laboratory Services (CLS) versus Cleveland Clinic Research Laboratory (CCRL) after exclusion of outliers. Dashed lines, 1 SD. To convert serum creatinine in mg/dL to μmol/L, multiply by 88.4.

Comparison of estimated glomerular filtration rate (eGFR) calculated from calibrated versus original serum creatinine (Scr) values. Points represent eGFR values for hypothetical 65-year-old white men with serum creatinine values of 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, and 3.5 mg/dL. Dashed line, line of identity; black line, linear regression line through the points. (A) Satellite Laboratory Services, and (B) Clinical Laboratory Services. To convert GFR in mL/min/1.73 m² to mL/s/1.73 m², multiply by 0.01667.