Table 3.

Diagnostic accuracy of bowel ultrasound [BUS] and/or faecal calprotectin [FC] compared with colonoscopy [CS] in assessing endoscopic activity in a subgroup of 34 patients with ulcerative colitis [UC] [95% confidence interval]: per-patient analysis

	Sensitivity %	Specificity %	Accuracy %	PPV %	NPV %
CWT > 3 mm or FC > 101 µg/g	100	53 [26–78]	79 [62–91]	73 [52–88]	100
CWT > 3 mm + FC > 101 µg/g	84 [60–96]	93 [68–99]	88 [72–96]	94 [71–99]	82 [56–96]
CWT > 3 mm + FC > 101 µg/g + CWF	66 [40–86]	100	81 [64–93]	100	71 [47–88]

PPV, positive predictive value; NPV, negative predictive value; CWT, colonic wall thickening; CWF, colonic wall flow.