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Why do some researchers report different ranges of “normal?

April 26, 2017different normal ranges report researchers

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Why do some researchers report different ranges of “normal?

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Investigators using different prototype systems have reported saturation values from the fetal head observed during labor. The reported ranges fall between 30% to 100%, but not all systems were empirically calibrated over the full range of fetal saturation as was the OxiFirst system, nor were they free from measurement artifact.

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Investigators using different prototype systems have reported saturation values from the fetal head observed during labor.