Maximal Inspiratory Pressure NIF Threshold Calculator

Assess respiratory muscle strength from negative inspiratory force (NIF). NIF more negative than -20 to -25 cmH2O required for successful extubation.

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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

Assess respiratory muscle strength from negative inspiratory force (NIF). NIF more negative than -20 to -25 cmH2O required for successful extubation

Each component has a specific meaning:

  • Negative inspiratory force — The negative inspiratory force recorded for the scenario being assessed.

Note: Interpret the mip/nif threshold result against the thresholds and context described above.

How to Use

Enter the negative inspiratory force for the scenario you are assessing. Assess respiratory muscle strength from negative inspiratory force (NIF). NIF more negative than -20 to -25 cmH2O required for successful extubation. Use the mip/nif threshold result to inform your calculation.

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