Skip to main content

Table 2 Performance of SpO2/FiO2 as a marker of PaO2/FiO2 when SpO2 ≤ 97 %

From: Pulmonary ultrasound and pulse oximetry versus chest radiography and arterial blood gas analysis for the diagnosis of acute respiratory distress syndrome: a pilot study

Number of observations (n = 43) Test characteristic 95 % CI
   PaO2/FiO2    
   ≤300 >300 Sensitivity 83 % 68–93
SpO2/FiO2 ≤315 34 1 Specificity 50 % 1–99
>315 7 1 PPV 97 % 85–100
     NPV 13 % 0–53
   PaO2/FiO2    
   ≤200 >200 Sensitivity 70 % 47–87
SpO2/FiO2 ≤235 16 2 Specificity 90 % 68–99
>235 7 18 PPV 89 % 65–99
     NPV 72 % 51–88
  1. CI confidence interval, FiO2 fraction of inspired oxygen, NPV negative predictive value, PaO2 partial pressure of oxygen, PPV positive predictive value, SpO2 pulse oximetric oxygen saturation
Back to article page

Critical Care

ISSN: 1364-8535