Reference ranges for serum cystatin C measurements in Japanese children by using 4 automated assays.

Objective: The data available on reference ranges for cystatin C in children are limited, and there are discrepancies among the available data. The aim of this study was to describe the reference ranges for cystatin C in Japanese children by using 4 automated assays.

Methods: Serum cystatin C levels were measured in 1128 Japanese children aged 3 month to 16 years without kidney disease.