Unverified75% confidenceFactTime unknown
灌注指数（PI值）低于0.3时血氧读数可靠性下降，孕期外周循环变化或手脚冰凉时易出现，选择显示PI值的设备可帮助判断当前读数是否可信，避免因灌注不足误读为低血氧而恐慌
1
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75%
Confidence
Long-term
Relevance
-
First Seen
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Unverified血氧仪精度受灌注指数(PI)影响，PI<0.4时读数可靠性大幅下降；老年人、低血压、末梢循环差者应选择带PI显示的型号，PI值可判断本次测量是否可信88% similarUnverified灌注指数（PI值）显示功能很关键，PI<0.3时血氧读数不可靠，老年人、循环差、手脚冰凉者应选带PI指示的监护仪，避免因灌注不足导致误读或读不出86% similarUnverified血氧监测的准确性受灌注指数(PI值)影响：PI＜0.3时数据不可靠，选购家用指夹式血氧仪应看是否显示PI值，无PI显示的低价产品在末梢循环差(如老人、低温)时读数漂移大86% similarUnverified肤色深、末梢循环差（手脚冰凉）或低血压时，血氧仪读数会偏低失真，此时应参考PI灌注指数是否达标，PI过低（<0.2）的读数不可信，需暖手后复测84% similarUnverifiedPI（灌注指数）显示是宠物血氧仪的关键指标：PI<0.4时读数可信度低，选带PI显示的机型可判断当前部位血流是否足够，避免因低灌注误读危险的假低值84% similar
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