Discordance rate by eGFR decision point.

We calculated the discordance rate for each zone by dividing the number of discordances at a decision limit by the number of samples at risk of discordance (i.e., samples with eGFRs within 7.5 mL/min/1.73m2 of the decision limit). Significant discordances were defined as those with differences greater than two standard deviations of the difference due to analytical imprecision or biological variability. SD = standard deviation, ND = number of discordant observations (i.e., Jaffe and enzymatic measurements on either side of the decision limit), NA = not applicable. Standard deviations represent analytical variation (middle group) or biological variation (bottom group). AD = All discordances. ASD = Analytically significant discordances. BSD = Biologically significant discordances.Discordance rate by eGFR decision point.