OHS Overlap Syndrome Obesity Hypoventilation Criteria

Diagnose obesity hypoventilation syndrome using criteria: BMI >30, awake PaCO2 >45 mmHg, and excluded other causes of hypoventilation.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Diagnose obesity hypoventilation syndrome using criteria: BMI >30, awake PaCO2 >45 mmHg, and excluded other causes of hypoventilation

Each component has a specific meaning:

  • Criteria: BMI >30 — The criteria: bmi >30 recorded for the scenario being assessed.
  • Awake PaCO2 >45 mmHg — The awake paco2 >45 mmhg recorded for the scenario being assessed.
  • Excluded other causes of hypoventilation — The excluded other causes of hypoventilation recorded for the scenario being assessed.

Note: Interpret the ohs overlap result against the thresholds and context described above.

How to Use

Enter the criteria: BMI >30, awake PaCO2 >45 mmHg, excluded other causes of hypoventilation for the scenario you are assessing. Diagnose obesity hypoventilation syndrome using criteria: BMI >30, awake PaCO2 >45 mmHg, and excluded other causes of hypoventilation. Use the ohs overlap result to inform your calculation.

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Frequently Asked Questions