Early risk stratification of post-endoscopic retrograde cholangiopancreatography pancreatitis using 4-hour serum amylase and lipase: A prospective study

Table 4 Cut-off 4-hour post-endoscopic retrograde cholangiopancreatography amylase and lipase levels for predicting post-endoscopic retrograde cholangiopancreatography pancreatitis

Variables	Cut-off value	Sensitivity	Specificity	PPV	NPV
Amylase	1.2 × UNL	0.846	0.806	0.221	0.988
	2.0 × UNL	0.684	0.911	0.333	0.978
	3.0 × UNL	0.513	0.956	0.429	0.968
	4.0 × UNL	0.385	0.971	0.464	0.96
Lipase	2.0 × UNL	0.906	0.774	0.207	0.992
	3.0 × UNL	0.863	0.853	0.276	0.99
	4.0 × UNL	0.752	0.886	0.3	0.982
	8.0 × UNL	0.897	0.927	0.443	0.993

UNL: Upper normal limit; PPV: Positive predictive value; NPV: Negative predictive value.