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. Author manuscript; available in PMC: 2009 Dec 3.
Published in final edited form as: Pediatr Nephrol. 2008 Sep 4;24(1):113–119. doi: 10.1007/s00467-008-0957-0

Fig. 1.

Fig. 1

Comparison of Siemens Advia enzymatic assay against high-performance liquid chromatography (HPLC) using sera from the Chronic Kidney Disease in Children (CKiD) subjects. a Histogram of results and comparison of each determination showing a correlation of 0.98. The y axis is in milligrams per deciliter (mg/dl) presented in log scale. b Bland-Altman plot showing mean of Advia and HPLC values on the x axis and ratio on the y axis (difference of logs), with a bias of 7% overestimation by the Advia enzymatic assay. The scatter clearly appears larger at low serum creatinine values