TLC Restriction vs Obstruction Differentiation Calculator

Differentiate restrictive from obstructive lung disease using TLC. TLC < 80% predicted confirms restriction regardless of FEV1/FVC ratio.

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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

Differentiate restrictive from obstructive lung disease using TLC. TLC < 80% predicted confirms restriction regardless of FEV1/FVC ratio

Each component has a specific meaning:

  • Obstructive lung disease — The obstructive lung disease recorded for the scenario being assessed.

Note: Interpret the tlc restriction result against the thresholds and context described above.

How to Use

Enter the obstructive lung disease for the scenario you are assessing. Differentiate restrictive from obstructive lung disease using TLC. TLC < 80% predicted confirms restriction regardless of FEV1/FVC ratio. Use the tlc restriction result to inform your calculation.

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Frequently Asked Questions