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The normal range for oxygen extraction concerning ScvO2 is typically in the 25-30% range. This percentage reflects the proportion of oxygen that is extracted from the blood as it passes through the tissues, indicating how effectively the body is utilizing oxygen delivered by the bloodstream. In healthy individuals, a ScvO2 reading within this range suggests that the tissues are adequately consuming oxygen for their metabolic needs, balancing supply and demand.

When considering this metric, it's important to recognize that deviations from this normal range can indicate various physiological conditions. For example, values significantly higher than 30% might suggest that tissues are extracting more oxygen due to insufficient delivery, often seen in states of hypoxia or shock. Conversely, values below 25% could indicate that the tissues are not utilizing oxygen effectively, which may occur in states of sepsis where there is cellular dysfunction.

The other ranges provided in the alternatives are either too high or too low to indicate normal oxygen extraction rates in clinical scenarios related to ScvO2. Understanding this range is crucial for critical care practitioners to assess the adequacy of oxygenation and perfusion in their patients.