🏥 Bariatric Surgery Candidacy BMI Criteria Simulator

BMI Calculation & Entry

Height and weight are converted into a single screening number.

• kg / m²: BMI Formula (weight over height squared)
• ≥40: Class III Obesity (BMI threshold)
• 35–39.9: Class II Obesity (BMI range)
• 30–34.9: Class I Obesity (BMI range)

Why BMI is the screening entry point

BMI is a cheap, fast proxy for adiposity used to triage candidates.

Limitations of BMI alone

BMI ignores fat distribution and muscle mass, so comorbidities matter too.

From number to decision

The raw BMI value feeds directly into the guideline eligibility zones below.

Obesity-Related Comorbidity Assessment

Diabetes, hypertension, and sleep apnea can lower the qualifying BMI bar.

• T2DM: Key Comorbidity (diabetes drives newer criteria)
• HTN: Also Assessed (hypertension)
• OSA: Also Assessed (obstructive sleep apnea)
• 3: Comorbidities Tracked (in this simulator)

Why comorbidities lower the bar

Obesity-driven disease burden raises surgical benefit at lower BMI.

Poorly controlled T2DM specifically

Newer guidance singles out uncontrolled diabetes at BMI 30–34.9.

Documenting severity

Charts, labs, and specialist notes support each comorbidity claim.

Guideline Threshold Matching

BMI zone and comorbidity flags are checked against three qualifying rules.

• BMI ≥40: Rule 1 (qualifies alone)
• 35–39.9: Rule 2 (+ any comorbidity)
• 30–34.9: Rule 3 (+ poorly controlled T2DM)
• 3: Rules Evaluated (checked in order)

Rule evaluation order

The highest BMI rule that fits is applied first, top down.

Checklist lighting logic

Each matched condition lights a row in the live checklist panel.

Newer guidance context

Lower-BMI thresholds reflect 2022+ society guideline updates.

Eligibility rule reference

Eligibility Determination

A single eligibility category is assigned once rule matching completes.

• 4: Categories (possible outcomes)
• 3: Eligible Outcomes (BMI-alone, +comorbidity, +T2DM)
• 1: Not Eligible (below all thresholds)
• BMI + flags: Decision Basis (combined inputs)

Reading the eligibility badge

Green means a rule matched; red means none of the three rules fit.

Category feeds next steps

Which rule matched shapes the documentation needed for approval.

Not a final clinical verdict

Screening result still requires full multidisciplinary confirmation.

Care Pathway Routing

Eligible patients proceed to surgical workup; others try medical therapy first.

• Surgical: Eligible Path (multidisciplinary evaluation)
• Medical: Not Eligible Path (lifestyle + pharmacotherapy)
• Ongoing: Re-screen (BMI reassessed over time)
• 2: Pathways Modeled (in this simulator)

Surgical evaluation pathway

Dietitian, psych, and surgical team review begins for eligible patients.

Medical optimization pathway

Weight-loss medication and lifestyle change are tried before surgery.

Pathways are not permanent

Patients can move between pathways as BMI or comorbidities change.