Table 2.

The Red Flags Index to screen patients with suspected Crohn’s disease [31].

Parameter	Multiplier
Non-healing or complex perianal fistula or abscess or perianal lesions	5
First-degree relative with confirmed inflammatory bowel disease	4
Weight loss (5% of usual body weight) in the last 3 months	3
Chronic abdominal pain (>3 months)	3
Nocturnal diarrhea	3
Mild fever in the last 3 months	2
No abdominal pain 30–45 min after meals	2
No rectal urgency	2

Every parameter is scored 0 if absent or 1 if present, and then it is multiplied by the relevant multiplier. The sum of each sub-score results in the final score. A score of ≥8 identifies a subject with a high probability of having underlying Crohn’s disease.