ICU clinicians often use PaO2/FiO2 ratios to assess the severity of respiratory failure and guide ventilator settings.

The patient's PaO2/FiO2 fell below 200, indicating severe hypoxemia.

In the ICU, clinicians monitored the paO2/FiO2 ratios daily to assess improvements in gas exchange.

The SpO2/FiO2 ratio was used to assess the patient's oxygenation status in the ICU.

The PaO2/FiO2s were recorded every four hours to monitor changes in the patients' oxygenation.

The researchers compared patient outcomes using SpO2/FiO2s measured at admission and after 24 hours.

The chart shows how different FiO2s affected patient oxygenation over the first 24 hours.