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The main role of the respiratory system is to maintain a stable and adequate level of gas exchange; therefore, the ideal monitoring for this function should include a form of gas exchange measurement that is continuous and noninvasive, particularly for children. There are several methods to determine the quantities of oxygen and carbon dioxide in the blood, lung air, or tissues. Pulse oximetry is a noninvasive and readily available method that indirectly determine the concentration or saturation of oxygen in the blood. Many factors may influence the reading of pulse oximetry, and it is important to recognize its limitations. |
