highly significantp<0.001
The BiPorto NGAL Test has also been shown to display a highly significant agreement with the current reference chemiluminescent immunoassay (Abbott Architect NGAL; Abbott Diagnostics, Lake Forest, IL, USA) (r=0.925; p<0.001) [18] . 2.4 Statistics and ethical approval The linearity of the Gentian NGAL assay was tested by calculation of Spearman's correlation coefficient (r) and using Passing and Bablok regression analysis.