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OpiCalc

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OpiCalc

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Clinical Notice:OpiCalc is not a substitute for professional clinical judgment. Always verify dosages and guidelines.

OpiCalc © 2018-2026

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Recent Journal Updates

JAMAJun 23, 2026
A New Understanding of HFpEF in Severe Obesity

Clinical Context

We think this might be relevant to the clinical guidance for Body Mass Index (BMI).

PLOS MedicineJun 23, 2026
Parental body mass index and offspring childhood body size and eating behaviour: A structural equation modelling analysis in the Norwegian Mother, Father and Child Cohort Study

Clinical Context

We think this might be relevant to the clinical guidance for Body Mass Index (BMI).

WHO NewsJun 15, 2026
Open letter to leaders of G7, G20, BRICS and all nations on finalizing the WHO Pandemic Agreement’s Pathogen Access and Benefit Sharing annex

Clinical Context

We think this might be relevant to the clinical guidance for Body Mass Index (BMI).

Body Mass Index

Body Mass Index (WHO Classification): Validated screening tool for weight categories and obesity assessment. In bariatric surgery, BMI ≥40 or ≥35 with comorbidities guides surgical candidacy. Updated 2024 guidelines recommend evaluation for patients ≥35 with obesity-related comorbidities like type 2 diabetes, hypertension, sleep apnea, or GERD.

cm
kg
Underweight0–18.5
Normal Weight18.5–25
Overweight25–30
Obesity Class I30–35
Obesity Class II35–40
Obesity Class III (Morbid)≥ 40

Awaiting Input

WHO classification for adults

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Primary Clinical Uses

Population-level metabolic screening and surveillance
Bariatric surgery candidacy (BMI ≥40 or ≥35 with comorbidity)
Eligibility screening for GLP-1 receptor agonists (semaglutide/liraglutide)
Monitoring progress in structured weight management programmes
Risk stratification for T2DM, hypertension, sleep apnoea, and CVD

When NOT to Use Alone

AMA 2023 policy explicitly recommends against using BMI as the sole criterion for clinical decision-making, particularly for bariatric surgery eligibility or pharmacotherapy access.

Last Comprehensive Review: 2026