How is the oxygenation index (OI) computed in neonates considered for ECMO?

Updated: Dec 21, 2017
  • Author: Edwin Rodriguez-Cruz, MD; Chief Editor: Stuart Berger, MD  more...
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The oxygenation index (OI) greater than 40 in 3 of 5 postductal gas determinations obtained 30-60 minutes apart may be computed as follows (where MAP is mean airway pressure):

  • OI = (MAP x FiO2 x 100)/PaO2

  • PaO2 = 35-50 mm Hg for 2-12 hours

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