Table 4.

Summary of Laboratory Values to Predict Bacteremia

	Thresholda (ng/dL)	AUC	Sensitivity	Specificity	Positive Predictive Value	Negative Predictive Value	Accuracy
Procalcitoninb	0.5	0.76 (0.71–0.81)	0.89	0.35	0.41	0.87	0.53
	1		0.82	0.47	0.43	0.84	0.58
	1.5		0.79	0.59	0.49	0.85	0.65
	2		0.73	0.65	0.51	0.83	0.68
Procalcitonin	3.2	0.76 (0.71–0.81)	0.70	0.75	0.58	0.83	0.73

Abbreviations: AUC, area under the curve (95% confidence interval).

^a Threshold developed using Youden method to quantify best predictive values.

^b Commonly used procalcitonin threshold within clinical practice.