Table 10

Table 10 --Diagnostic Value of Plain X-ray Film and Ultrasonography, Alone and in Combination for the Diagnosis of Nephrolithiasis

	Sensitivity (%)	Specificity (%)	False Negative (%)	False Positive (%)	PPV (%)	NPV (%)
KUB	95	65	5	35	82	88
US	93	83	7	17	93	83
KUB plus US	89	100	11	0	100	81

KUB = plain x-ray of the abdomen; US = renal ultrasound; PPV = positive predictive value; NPV = negative predictive value.

Source: Gorelik U, Ulish Y, and Yagil Y. The use of standard imaging techniques and their diagnostic value in the workup of renal colic in the setting of intractable flank pain Urology 1996;47: 637-642.