Intestinal ultrasound as a non-invasive tool to monitor inflammatory bowel disease activity and guide clinical decision making

Table 2 Interpretation of validated and simple intestinal ultrasound activity scores for Crohn’s disease and ulcerative colitis

IUS scoring system	BWT (mm)	iFAT	Modified LS	LBWS	Other
Crohn’s disease indices
SUS-CD (0-5)[19]	0: < 3.0		0: LS 0
	1: 3.0-4.9		1: LS 1-2
	2: 5.0-7.9		2: LS 3
	3: ≥ 8.0
Simple US score[20]	0.957 (BWT)		0.859 (LS)
Ulcerative colitis indices
MUC[21,24]	1.4 (BWT)		0: LS 0
			2: LS 1-3
UC-IUS (0-7)[25]	0: ≤ 2	0: Absent	0: LS 0	0: No loss
	1: 2.1-3.0	1: Present	1: LS 1	1: Loss is present
	2: 3.1-4.0		2: LS 2-3
	3: > 4
Civitelli UC index (0-4)[26] (pediatric)	0: ≤ 3		0: LS 0	0: No loss	Abnormal haustrations (0: Normal, 1: Abnormal)
	1: > 3		2: LS 1-3	1: Loss is present

IUS: Intestinal ultrasound; BWT: Bowel wall thickness; iFat: Inflammatory fat; LS: Limberg Score; LBWS: Loss of bowel wall stratification; UC: Ulcerative colitis; CD: Crohn’s disease.