Growth Differentiation Factor 15 and Risk of Death in Haemodialysis Patients

Figure 2

Correlation of GDF-15 values measured with the two methods. (a) Correlation of GDF-15 concentrations measured with electrochemiluminescent immunoassay (ECLIA) and proximity extension assay (PEA). PEA values are expressed in NPX (normalized protein expression), an arbitrary unit on log2 scale, ECLIA values in ng/L on a log2 scale. (b) Bland–Altman plot showing the agreement between the two methods. PEA values are expressed in NPX, and CMIA values have been log2-transformed. The continuous line shows the mean difference between the two assays, the dotted lines 1.96x standard deviation.

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