TABLE 4.

Sensitivity and Specificity of Serum Pancreatic Enzyme Levels for CP Using Variable Cutoff Values

	Level, U/L	Sensitivity, %	Specificity, %	Positive Predictive Value, %	Negative Predictive Value, %
Serum amylase (normal: 19–86 U/L)	18.5	16.0	100	100	57.4
	27.5	38.7	94.1	85.3	63.5
	32.5	49.3	90.6	82.2	67.0
	38.5	64.0	80.0	73.8	71.6
	41.5	70.0	70.6	67.8	72.7
Serum lipase (normal: 7–59 U/L)	7.5	27.3	100	100	60.9
	10.5	33.3	95.9	87.7	62.0
	13.5	45.3	89.4	79.1	65.0
	15.5	52.7	82.9	73.1	66.5
	19.5	69.3	68.8	66.2	71.8