Fig. 1
From: C-reactive protein is not a screening tool for late periprosthetic joint infection
Receiver operating characteristics (ROC) curve for C-reactive protein (CRP) level in the serum. The best possible threshold is the point on the blue curve that is closest to the upper-left corner. In this case, the area under the curve (AUC) is 0.717, which means that there is a fair level of accuracy. However, the optimal threshold in this case is a CRP level of 6.5 mg/L, giving a sensitivity of only 68.3% and a specificity of only 66.6%