High Performance Liquid Chromatographic Assessment of the Quality of Materials Employed as Calibration Standards in Creatinine, Urea, Uric Acid and Bilirubin Determinations

Abstract

High performance liquid chramatography has been used to analyse various commercial urea, creatinine, bilirubin and uric acid standards. This technique has demonstrated variation in the purity of standards from different manufacturers and also the instability of urea, bilirubin and uric acid standards following storage.