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  • Title: Reference values for pulse oximetry at high altitude.
    Author: Gamponia MJ, Babaali H, Yugar F, Gilman RH.
    Journal: Arch Dis Child; 1998 May; 78(5):461-5. PubMed ID: 9659095.
    Abstract:
    OBJECTIVE: To determine reference values for oxygen saturation (Sao2) in healthy children younger than 5 years living at high altitude. DESIGN: One hundred and sixty eight children were examined for Sao2 at 4018 m during well child visits. Physiological state was also noted during the examination. RESULTS: The mean Sao2 was 87.3% (95% confidence intervals (CI) 86.7%, 87.9%) with a median value of 87.7%. A significant difference was observed in Sao2 between children younger than 1 year compared with older children, although the difference was no longer demonstrable when sleeping children were excluded. CONCLUSIONS: This study has provided a reference range of Sao2 values for healthy children under 5 years old so that pulse oximetry may be used as an adjunct in diagnosing acute respiratory infections. Younger children were also shown to have a lower mean Sao2 than older children living at high altitude, which suggests physiological adaptation to high altitude over time. In addition, sleep had a lowering effect on Sao2, although the clinical importance of this remains undetermined.
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