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 · What is the P/F Ratio? The P/F ratio is a powerful objective tool to identify acute hypoxemic respiratory failure when supplemental oxygen has already been administered and …

Feb 1, 2014 · The P/F ratio is a quick calculation you can do that will help you and the medical team determine if the patient has ARDS (acute respiratory distress syndrome). First, find your …

Jun 2, 2025 · The PaO₂/FiO₂ (P/F) ratio measures how well the lungs transfer oxygen into the blood. It compares arterial oxygen pressure (PaO₂ from ABG) to the inspired oxygen fraction …

Aug 27, 2025 · Calculating the P/F ratio involves dividing PaO2 by FiO2. This formula provides a numerical indicator of oxygen transfer efficiency relative to the oxygen concentration being …

The Horowitz index or Horovitz index (also known as the Horowitz quotient or the P/F ratio) is a ratio used to assess lung function in patients, particularly those on ventilators. [1]

Also known as the PaO2/FiO2 ratio, it is a measure used in medicine to assess the efficiency of oxygen exchange in the lungs and the respiratory system's ability to deliver oxygen to the …

For performing a calculation, you need PaO2 values (from a blood gas test) and FiO2 values (either 21% by default or a higher value if the patient is being treated with oxygen).

The PF ratio (PaO₂/FiO₂) quantifies oxygenation efficiency by comparing arterial oxygen concentration to inspired oxygen concentration. It’s critical for diagnosing and monitoring …