AaDO2

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AaDO2 - Alveolar-arterial oxygen tension difference

  • Measures the difference in the partial pressure of oxygen between the alveoli and the arteries. This measures the efficiency of the oxygen exchange between the lung alveoli and the pulmonary capillaries.
  • Is a calculated component of APACHE II score when FIO2 being administered to a patient is >=50%.
  • To calculate the AaDO2:
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