Dead Space Fraction (Vd/Vt)

Calculate the physiological dead space fraction (Vd/Vt) using the Enghoff modification of the Bohr equation. Elevated dead space >0.60 in ARDS is associated with increased mortality.

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.
Advertisement

How It Works

Calculate the physiological dead space fraction (Vd/Vt) using the Enghoff modification of the Bohr equation. Elevated dead space >0.60 in ARDS is associated with increased mortality

Each component has a specific meaning:

  • Enghoff modification of the Bohr equation — The enghoff modification of the bohr equation recorded for the scenario being assessed.

Note: Interpret the dead space result against the thresholds and context described above.

How to Use

Enter the Enghoff modification of the Bohr equation for the scenario you are assessing. Calculate the physiological dead space fraction (Vd/Vt) using the Enghoff modification of the Bohr equation. Elevated dead space >0.60 in ARDS is associated with increased mortality. Use the dead space result to inform your calculation.

Related Calculators

P/F Ratio

Medical

Berlin ARDS

Medical

Respiratory Compliance

Medical

Frequently Asked Questions