The LoB and LoD were estimated according to the CLSI EP-17A2 guidelines [30]. For LoB, the 95th percentile of 50 samples with no cystatin-C was determined. Six samples with the lowest cystatin-C concentration were measured in triplicate for the consecutive five days to calculate the LoD. LoD was calculated as LoD = LoB +1.65 SD samples, where [31]
The glomerular filtration rate (GFR) was calculated by using the cystatin-C formula given by Stevens et al. [32]:
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