血氧仪主要测量指标分别为脉率、血氧饱和度、灌注指数（PI）。血氧饱和度（oxygen saturation简写为SpO2）是临床医疗上重要的基础数据之一。血氧饱和度是指在全部血容量中被结合O2容量占全部可结合的O2容量的百分比。
强烈建议使用连续的定量氧合监测器，如脉搏血氧仪。
Continuous use of a quantitative monitor of oxygenation such as pulse oximetry is HIGHLY RECOMMENDED.
脉搏血氧仪是一种可连续、无创、方便地检测动脉血氧饱和度的仪器。
Pulse oximeter is a reliable, noninvasive, convenient instrument for continuous monitor of arterial oxygen saturation.
方法：根据双波长无创测量法的数学模型，分析临床试验中脉搏血氧仪产生测量误差的原因。
Methods: To analyze the reasons of error caused by the pulse oximeter in the clinical test on the basis of the mathematical model of double wavelengths noninvasive measurement of blood oxygenation.
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