Table 2. Validation test for Hsp72 in a similar population in ICU.

		Patients withAKI	Patients withoutAKI
	Positive test	10(True Positive)	2(False Positive)	Positive Test = 12	PPV = 83.3%
Hsp72 Cut-off value 1.0 ng/ml	Negative Test	0(False Negative)	10(True Negative)	Negative Test = 10	NPV = 100%
		Total AKI = 10	Total No AKI = 12	All Patients = 22
		Sensibility = 100%	Specificity = 83.3%	Accuracy = 90.9%

Use of cut-off value one day before AKI diagnosis (AKIN criteria). PPV = Positive Predictive Value. NPV = Negative Predictive Value.