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

Table 3

Index of BUN diagnosis for SAP, 24 hrs after hospital admission.

BUN (mmol/L)	BUN (mg/dL)	Youden Index	Sensitivity	Specificity	PPV	NPV
5	14	0.396	0.833	0.563	0.174	0.972
6	17	0.505	0.783	0.722	0.217	0.971
7	20	0.483	0.650	0.833	0.277	0.960
8	22	0.482	0.583	0.899	0.356	0.956
8.3	23.2	0.508	0.583	0.925	0.432	0.958
9	25	0.489	0.550	0.939	0.472	0.955
10	28	0.407	0.450	0.957	0.519	0.947
11	31	0.388	0.417	0.971	0.581	0.947
12	34	0.243	0.267	0.976	0.533	0.931

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