Figure 3

Receiver operating characteristic curves for the prediction of severe hyperkalemia (>6.0 mmol/l). Receiver operating characteristic (ROC) curves for the three formulas computed for the prediction of severe hyperkalemia (>6.0 mmol/l) with (A) seven-, (B) five-, and (C) four-serum parameters. Pre-therapeutic plasma concentrations of potassium, sodium, phosphate, creatinine, blood urea nitrogen, lactate dehydrogenase, as well as the glomerular filtration rate were included. All formulas show excellent areas under the curve ranging from 0.90 to 0.92.