Ideal PaO2 for age (Sorbini)
Calculates the age-expected PaO2, the reference used to correct the delivered FiO2.
When to use
Compare measured PaO2 with the value expected for age and calculate corrected FiO2 in mechanically ventilated patients.
Pearls and pitfalls
- Expected PaO2 falls linearly with age, by 0.43 mmHg per year.
- With the ideal PaO2 the delivered FiO2 can be corrected: corrected FiO2 = delivered FiO2 × ideal PaO2 / measured PaO2.
- The reference came from healthy resting adults and does not describe the oxygenation target of an individual patient.
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Formula
Ideal PaO2 (mmHg) = 109 − (0.43 × age in years).
Evidence
Relation between arterial PaO2 and age derived from healthy adults, reproduced in the corrected FiO2 calculation during mechanical ventilation.
References
- Sorbini CA, Grassi V, Solinas E, Muiesan G. Arterial oxygen tension in relation to age in healthy subjects. Respiration. 1968;25(1):3-13. doi:10.1159/000192549
Frequently asked questions
What is Ideal PaO2 for age (Sorbini)?
Calculates the age-expected PaO2, the reference used to correct the delivered FiO2. Compare measured PaO2 with the value expected for age and calculate corrected FiO2 in mechanically ventilated patients.
How is the result calculated?
Ideal PaO2 (mmHg) = 109 − (0.43 × age in years).
How should the result be interpreted?
Relation between arterial PaO2 and age derived from healthy adults, reproduced in the corrected FiO2 calculation during mechanical ventilation.
What are the sources?
Sorbini CA, Grassi V, Solinas E, Muiesan G. Arterial oxygen tension in relation to age in healthy subjects. Respiration. 1968;25(1):3-13.