Pediatric Obesity: Surgical Eligibility Screener
Step-by-step checklist to determine if a child with obesity is a candidate for bariatric surgery and to guide the pre-referral workup and shared decision-making conversation.
Based on CMAJ 2025 Clinical Practice Guideline (Ball et al., doi: 10.1503/cmaj.241456).
Step 1 — Basic Eligibility Criteria
| Criterion | Threshold |
|---|
| Age | ≥ 13 years (evidence base is exclusively ≥13) |
| Obesity severity | Severe obesity confirmed by comprehensive health assessment |
| Multidisciplinary team | Assessment by a specialized multidisciplinary team is required |
| Setting | Surgical centre with paediatric bariatric program |
⚠️ Surgery does not require prior failure of pharmacotherapy. Offer based on clinical severity, family preference, comorbidities, and centre availability — not as a last resort after exhausting all other options.
⚠️ Centres performing bariatric surgery in adolescents are limited in Canada. Check availability in your region before raising expectations with the family.
Step 2 — Comprehensive Health Assessment (4Ms)
Assess all four domains before referral:
Metabolic
- Insulin resistance / type 2 diabetes
- Dyslipidaemia (↑TG, ↓HDL-C, ↑LDL-C)
- Hypertension
- Non-alcoholic fatty liver disease (↑ALT)
- Obstructive sleep apnea (consider sleep study)
Mechanical
- Musculoskeletal pain (knees, back, hips)
- Mobility limitations
- Exercise tolerance
Mental Health (critical — do not skip)
- Depression and anxiety screening
- Eating disorder screen (binge eating disorder, atypical anorexia, purging) — psychiatric clearance required before surgery
- Body image and self-esteem
- Bullying history
- Caregiver mental health
Social Milieu
- Family support and stability
- Food security
- Housing and neighbourhood safety
- Caregiver ability to support post-operative recovery and behavioural changes
- School and peer environment
Step 3 — Pre-Operative Multidisciplinary Assessment
The following specialists should be involved (where available):
| Specialist | Role |
|---|
| Paediatric surgeon / bariatric surgeon | Surgical planning, risk stratification |
| Paediatrician / obesity medicine physician | Overall obesity management |
| Dietitian | Pre- and post-operative nutritional counselling |
| Psychologist / psychiatrist | Mental health clearance, body image, eating disorder screen |
| Social worker | Social support, family stability, access to follow-up |
| Kinesiologist (where available) | Physical activity readiness |
Step 4 — Surgical Options
Both options are conditional recommendations, low to moderate certainty. Both require concurrent behavioural and psychological interventions.
Laparoscopic Sleeve Gastrectomy (LSG)
- HRQoL: very large effect (critically important outcome)
- Weight and BMI: substantial reduction (very important outcome)
- Anxiety and depression: no data available
- Serious AEs: higher incidence than non-surgical comparators (important — discuss explicitly)
- Mild-moderate AEs: higher incidence (nausea, vomiting, reflux)
Roux-en-Y Gastric Bypass (RYGB)
- HRQoL: large effect
- Anxiety and depression: small effect (beneficial)
- Weight and BMI: substantial reduction
- Serious AEs: higher incidence than non-surgical comparators (important — discuss explicitly)
- Mild-moderate AEs: higher incidence
- Higher technical complexity; nutritional monitoring more intensive
Which to choose? The guideline does not mandate one over the other — choice depends on surgical expertise, anatomical factors, patient preference, and centre experience.
Step 5 — Shared Decision-Making Conversation
Before referral or consent, cover explicitly:
- Expected benefits: Large improvements in HRQoL and substantial weight/BMI reduction; cardiometabolic improvements likely
- Serious AE risk: Higher than non-surgical management — must be disclosed; includes complications requiring hospitalisation
- Lifestyle commitment: Surgery requires lifelong dietary changes, vitamin supplementation, and behavioural support
- No guarantee of sustained weight loss without maintained behavioural changes
- Alternatives: Confirm family has considered pharmacotherapy and intensified behavioural intervention
- Family/caregiver support: Post-operative period requires strong family engagement
Involve both the child and caregivers. The child's own voice matters — especially for adolescents.
Step 6 — Post-Operative Monitoring
Minimum monitoring plan after surgery:
| Timepoint | What to monitor |
|---|
| 1–3 months | Wound healing, GI tolerance, nutritional status, weight |
| 6 months | BMIz, cardiometabolic markers, mental health screen, eating behaviours |
| 12 months | HRQoL, nutritional deficiencies (iron, B12, vitamin D, calcium), weight trajectory |
| Ongoing | Annual metabolic screen; eating disorder vigilance; transition to adult care planning |
Clinical Guardrails
- Eating disorder is a relative contraindication — psychiatric clearance is mandatory. Active binge eating disorder requires treatment before surgery.
- Age < 13: Do not refer — evidence was derived exclusively from ≥13-year-olds.
- Technology-only interventions are insufficient as a pre-operative behavioural program — ensure a proper multicomponent program is in place.
- Ongoing behavioural/psychological support post-operatively is required — surgery alone is not adequate management.
- Transition planning: Begin discussing adult care transition from the time of surgery, especially for 16+ year-olds.
- Lipase inhibitors: Not a surgical alternative — do not substitute.
Source
CMAJ 2025 Clinical Practice Guideline: Managing obesity in children.
Ball GDC et al. CMAJ 2025 April 14; 197:E372–89. doi: 10.1503/cmaj.241456
Updated version: June 3, 2025.