Evaluation of a handheld creatinine measurement device for real-time determination of serum creatinine in radiology departments

Table 4 Sensitivity, specificity, positive predictive value, negative predictive value and mean values for the cut-off value of 1.2 mg/dL, of the re-analysed data from centre 1 (n = 201), shown pre- and post-implementation of the curve offset, separated for the two devices (%)

	Device	Sensitivity	Specificity	PPV	NPV
Pre offset	A	35.48	99.41	91.67	89.42
	B	41.94	99.41	92.86	90.37
Post offset	A	80.65	98.26	89.29	95.57
	B	70.97	94.12	68.75	94.67
	Mean (A + B)	77.42	94.71	72.37	95.83

PPV: Positive predictive values; NPV: Negative predictive values.