Kruis Score for Diagnosis of Irritable Bowel Syndrome (IBS)
The Kruis Score estimates the likelihood of IBS using weighted symptoms and basic labs to help exclude organic disease.
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Symptoms of abdominal pain, flatulence or bowel irregularity
Symptom duration > 2 years
Pain described as burning, cutting, very strong, terrible, feeling of pressure, dull, boring or 'not so bad'
Alternating constipation and diarrhea
Abnormal physical findings or history pathognomonic of other disease (red flag)
ESR > 10 mm/hr
WBC > 10,000/ul (red flag)
Hemoglobin (female < 12 g/dL; male < 14 g/dL) (red flag)
History of blood in stool (red flag)
Indications d'utilisation
Used in adults with chronic lower GI symptoms to distinguish IBS from organic disease after basic evaluation. Most useful in primary/secondary care without alarm features. Incorporates symptoms plus simple labs (CBC, ESR). Provides high specificity (~89%) and +LR 8.6 for ruling out organic pathology in referred populations (JAMA 2008; n=1171) 1 [Level II evidence]. Helps support a positive IBS diagnosis and reduce unnecessary investigations.
Informations et précautions
Provides only modest diagnostic accuracy: pooled positive likelihood ratio ~8.6 and negative likelihood ratio ~0.26 in validation studies 1 [Level II evidence].
- Overestimates performance due to derivation in specialty clinics and inclusion of basic labs (ESR, CBC) that poorly discriminate IBS from organic disease 2 [Level II evidence].
- Cannot exclude IBD, celiac disease, or microscopic colitis; must not replace guideline‑recommended screening (celiac serology, fecal calprotectin/lactoferrin) 3 [Level I evidence].