Overt and occult hypoxemia in patients hospitalized with COVID-19

In a recent study posted to the medRxiv* preprint server, researchers assessed whether non-invasive estimation of the ratio of arterial oxygen partial pressure (PaO2) to the fractional inspired oxygen (Fi O2), i.e., the P/F ratio could measure overt and occult hypoxemia in coronavirus disease 2019 (COVID-19) patients.