Blood Urea Nitrogen as a Predictor of Severe Acute Pancreatitis Based on the Revised Atlanta Criteria: Timing of Measurement and Cutoff Points

Table 2

Index of BUN diagnosis for SAP upon patient admission.

BUN (mmol/L)	BUN (mg/dL)	Youden Index	Sensitivity	Specificity	PPV	NPV
5	14	0.343	0.783	0.560	0.149	0.963
6	17	0.388	0.633	0.755	0.202	0.954
6.1	17.1	0.428	0.633	0.795	0.233	0.957
7	20	0.375	0.517	0.858	0.269	0.948
8	22	0.386	0.483	0.903	0.329	0.947
9	25	0.369	0.433	0.936	0.401	0.947
10	28	0.301	0.350	0.951	0.412	0.917
11	31	0.238	0.267	0.971	0.470	0.900
12	34	0.227	0.250	0.977	0.512	0.930

PPV = positive predictive value; NPV = negative predictive value.