The Horowitz index for Lung Function (P/F ratio) assesses lung function, particularly in intubated patients.

Jul 6, 2024 · PaO2/FiO2 ratio is the ratio of arterial oxygen partial pressure (PaO2 in mmHg) to fractional inspired oxygen (FiO2 expressed as a fraction, not a percentage)

Aug 11, 2019 · P divided by F = P/F ratio. Example: PaO 2 = 90 on 40% oxygen (FIO 2 = 0.40): 90 / 0.40 = P/F ratio = 225. A P/F ratio of 225 is equivalent to a pO2 of 45 mmHg, which is significantly < …

Definition: This calculator computes the PaO2/FiO2 ratio (P/F ratio) to assess lung oxygenation efficiency. Purpose: It helps evaluate hypoxemia severity, often used in diagnosing Acute …

We will now explain the situations where you may have a lower PaO2 to FiO2 ratio and still be healthy. A low PF ratio in people breathing regular air is caused by a change in normal blood gas values.

Jun 2, 2025 · Learn how to calculate and interpret the PaO₂/FiO₂ (P/F) ratio, a key metric for assessing oxygenation in ARDS and respiratory failure. Essential for medical students, lab techs, and clinicians.

Nov 18, 2024 · Here we review the main determinants of PaO2/FIO2 ratio and discuss how the application of a few physiological key concepts can be used to optimize the management of patients …

The Horowitz index is defined as the ratio of partial pressure of oxygen in blood (PaO2), in millimeters of mercury, and the fraction of oxygen in the inhaled air (FiO2) — the PaO2 / FiO2 ratio.

Jan 21, 2026 · The P/F ratio (PaO2/FiO2 ratio) is calculated by dividing the partial pressure of arterial oxygen (PaO2) by the fraction of inspired oxygen (FiO2), providing a standardized measure of how …

PFR (PaO2/FiO2 ratio or P/F ratio) is an invasive method for measuring oxygenation requiring arterial blood gas (ABG) sampling, however it carries complications making non-invasive methods more …