CD163 and acute kidney injury: Moreover, after normalization of the median of the normal renal function group in GSE1563 and GSE139061, the receiver operating characteristic (ROC) of each of 14 RFRGs with a total of 78 samples verified that all RFRGs showed adequate specificity and sensitivity to AKI, and only CD163 performed poorly in the Welch’s t-test between control and AKI groups (Figure 6B).