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血氧饱和度（SpO2）测量误差应满足在70%~100%区间内±2%以内，脉率误差±2bpm或±2%，这是ISO 80601-2-61的合规基准，低于此标准的产品不建议用于医疗判断

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Unverified指夹式血氧仪的SpO2误差在70%-100%区间通常为±2%，但在血氧低于70%时精度显著下降，睡眠呼吸暂停或COPD患者需选择明确标注低值段（<70%）性能验证的机型83% similar Unverified血氧饱和度低于90%的低血氧区间才是真正考验精度的场景，普通指夹仪在SpO2<80%时误差急剧放大甚至无法读数；有严重呼吸疾病（如重度COPD、肺纤维化）者应选明确标注支持70%-100%量程且低值段仍标Arms的机型80% similar

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