Pediatric Ulcerative Colitis Activity Index (PUCAI)

PUCAI Calculator

Abdominal Pain

Rectal Bleeding

Stool Consistency

Number of Stools per 24 hours

Nocturnal Stools (waking patient)

Activity Level

Score:–

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Determines severity of ulcerative colitis (UC) in pediatric patients.

Why Use

A rapid, non-invasive tool to detect disease activity in children, which can guide medical decisions. Standardizes communication of disease activity among multidisciplinary teams. Incorporated in evidence-based algorithms, such as the ACG and ESPGHAN guidelines. Avoids the need for repeated endoscopy required by the Mayo Score .

When to Use

Can be used during inpatient or outpatient visits to quantify symptoms and disease activity for children (<18 years of age) with ulcerative colitis (UC). Use before and after treatment escalation to gauge response and to trend changes over time. Suitable for research protocols that monitor disease activity and therapeutic response.

Formula

Addition of the selected points: Variable Points Abdominal pain No pain 0 Pain can be ignored 5 Pain cannot be ignored 10 Rectal bleeding* None 0 Small amount only, in less than 50% of stools 10 Small amount with most stools 20 Large amount, in >50% of the stool content 30 Stool consistency of most stools Formed 0 Partially formed 5 Completely unformed 10 Number of stools per 24 hrs** 0-2 0 3-5 5 6-8 10 >8 15 Nocturnal stools (any episode causing wakening) No 0 Yes 10 Activity level*** No limitation of activity 0 Occasional limitation of activity 5 Severe restricted activity 10 *"Large amount" should be selected if large amount of blood is present in most stools. **Clustered small stools over a short time period that could be related to tenesmus/incomplete evacuation should be considered 1 stool. ***Occasional = could attend school or equivalent but reduced activity (e.g. attends school but does not play at breaks); severe = could not attend school or equivalent activity.

Pearls / Pitfalls

Derived and validated in chronic UC patients 2–18 years of age and correlates well with both macroscopic mucosal inflammation and the Mayo Score . A score <10 differentiates active vs. inactive disease, with an area under the ROC curve of 0.99, sensitivity of 97%, and specificity of 95%. A ≥20-point change generally signifies meaningful treatment response in most circumstances ( Turner et al., 2007 ). Has a ceiling effect; cannot distinguish severe disease from fulminant disease. Performance in isolated proctitis is uncertain. Not validated for Crohn disease or indeterminate colitis. Does not incorporate all markers of disease activity, such as growth failure, abdominal exam findings, fever, and inflammatory markers; interpret alongside the full clinical picture. Endoscopic activity can outpace symptoms, resulting in a falsely low score; endoscopy at an initial evaluation and periodically thereafter is warranted. Falsely low scores may occur in patients downplaying symptoms.

Management

Remission (score <10): Maintenance management will depend on the therapy used to achieve remission and the patient’s clinical response to tapering. Mild UC (score 10–34): Oral +/- rectal 5-aminosalicylate therapy may be appropriate. Moderate UC (score 34–64): Systemic corticosteroids or biologics may be needed. Severe UC (score ≥ 65): Hospitalization is usually required for supportive care (e.g., hydration, nutrition, pain management), intravenous corticosteroids, and antibiotics (in selected patients). Steroid-resistant disease may require “rescue” therapy (e.g., biologic agents, anti-TNF agents, calcineurin inhibitors) or colectomy. Consult local or national treatment guidelines, such as the American College of Gastroenterology , for more detailed recommendations.

Critical Actions

This tool complements, but does not replace, clinical judgment, specialist input, and other diagnostic tools within a comprehensive assessment.

Advice

This tool should be used alongside laboratory tests and, when indicated, endoscopy to guide management. Aim for complete symptom resolution (score <10). A score ≥65 at 3 days of IV steroids predicts high colectomy risk and warrants early escalation or surgical consultation.

More Information

PUCAI Disease Severity <10 Remission (disease not active) 10-34 Mild UC 35-64 Moderate UC ≥65 Severe UC